These rumors come from BloodofKittens, which have been quite reliable in the past. I've heard a lot of similar rules to these so they all sort of make sense. Only a few of them raise flags for me being a bit overzealous.
HIGHLIGHTS SO FAR
This is a new statline that works with BS to determine if hit a unit
The Evasion Value indicates how hard it is to hit
the model. The smaller and faster, the better the
Evasion Value of a warrior. This characteristic is
not part of the model’s profile as it depends on
the speed of the model. A moving Tau Fire
Warrior has an Evasion of 3, a stationary Land
Raider tank only an Evasion of 1. This
characteristic is described on page 70.
Cover Save are now 5+ looks like for many things
The following is from duel live blogging courtesy of Reece from FrontlineGaming
Wound allocation: Back to 4th ed we go! All wounds are distributed by armor type, multi-wound models count for as many models as they have remaining wounds. Sarge and his special weapon buddies are last to die.
Running in the movement phase….most of us do this already!
Instant Death, this is awesome! Instant death is totally changed, if your toughness is exceeded by 4 points of strength you take 2 wounds. By 5, 3 wounds, etc. Tyranids, rejoice!
If you double your opponent’s WS, you hit on 2′s in combat!
If you double your opponent’s WS, you hit on 2′s in combat! If their WS is double yours, you hit on a 5, triple, you hit on a 6!
Rigid saves: sounds like FnP, but is ignored by AP 1,2,3 or instant death attacks. FnP is Rigid 4+
Removed from play now just means removed as a casualty. Necrons get a break from JotWW!
Preferred enemy: Shooting and HtH! But like 4th ed, always hit on a 3+, if normally hitting on a 3+, now hits on a 2+. If you choose to shoot at a unit that you have PE against, but don’t, you lost the rule for the rest of the game! Now Destroyers with preferred enemy: Everything! makes sense!
iers of Eternal Warrior, still reading it, but if you have EW 1, you ignore ID 1, etc. level 3 ignores all ID
If a unit can be singled out by an attack (JotWW) it becomes it’s own unit. Shielded (USR) ignores that rule.
Falling back is now your movement + D6″
some units can cause Terror which triggers a morale check
Shaken applies to all units now, like pinning for infantry and shaken as now for vehicles
Broken units automatically fail their morale if they lose a combat.
Surrounded: if broken and falling back, if you end your move within 12″ of an unengaged enemy model, the unit is destroyed! Wow!
Tactical Retreat: If a unit falls off the board, they are removed from play but does not count as destroyed. You can choose to leave the game and not give up a KP or VPs.
Immobilized counts for all unit types. Immobile units EV value (evasion) is decreased, usually +1 to hit them.
Tiered fearlessness: can be pinned or shaken. Nice! Fearless units are subject to rules but are better against them. Level 3 fearless ignores everything, though. Stubborn the same. Cold Blooded new rule allows you to choose to pass or fail. ATSKNF largely remains the same.
Critical hits: this is a blanket rule that automatically wounds and ignores all saves but invulnerable, vehicles take a penetrating hit. Triggered by certain attacks and difficult terrain roles, which now are on a 6, not a 1.
new Dense terrain type: can’t see through it at all. If a unit is in it, you ignore this unit for shooting.
Cover saves now 5+ for all but fortified ruins.
Skilled Rider now IGNORES difficult terrain checks.
Airborne rule: units with this rule ignore difficult and dangerous terrain, but still gain a cover save form it.
Move through cover: run/cruise through difficult terrain.
Turn phases: Move, Assault, Shoot, Consolidate
BIG! In order to control a mission objective, you must have it for an ENTIRE turn.
Turns are defined, things that occur :at the beginning of the turn” are clearly defined.
Cruise and Combat speed are for all units now, cruising or running for infantry, is a straight double movement, no more random roll.
You cannot shoot before charging anymore. A Charge is a double move.
Engage action: charge normal movement distance (not double), but can shoot in the following shooting phase
Flat Out: Triple movement
Fleet adds 2″ to your movement value!
Fast rule: shoot twice if stationary, shoot normally after moving or charging
Rage: can’t remain stationary, must take -1 morale check to not charge enemy unit within 12″
Alpha Strike: charging into terrain makes defenders I10, charging already engaged unit makes attacker I10
In HTH, if a template deviates onto combat, each unit under it only takes 1 hit. Can’t target into HtH.
BIG RULE: No Retreat is now a critical hit for every wound you lost combat by (ignores armor) but you can pass a morale check with a -1 for every wound you lost combat by. Wow, that levels the playing field, a LOT!
Sweeping advance: if you lose combat and fail a morale, you roll 5+ and break out of combat or are destroyed. If your In is higher than the pursuing unit’s In, you break off on a 4+
Hit and Run now only 3″, but can now shoot in the following shooting phase
Hulk rule: can not attack in HtH
Intractable rule: cannot be bound in HtH
All models with a base (infantry, walkers, MCs) do NOT block LOS. They grant a 5+ cover unless the squad leader of the firing unit can not see the target unit, in which case the save is a 4+
Look out sarge: a unit can force a cover save to a unit behind it, even if normally the target unit would not get a save, but the intervening unit takes a critical wound for every save that is passed
Evasion: 3 base for all units. Massive: Tanks, MCs, GCs, bastions, walkers, super-heavies -1 Ev. Stationary -1. Jink +1, Swarm +1, Flyer always a 6, point blank (squad leader is within 12″) EV always 3
Divide fire: if you have the divide fire rule, you can give up a shot to shoot all remaining weapons at different targets! A vehicle that holds still can do some serious work, but is easier to hit.
Night Vision now lets you reroll your check unless their stealth is higher than their Night Vision.
Multi-Targeting: if you have this rule, you can double your shots if you hold still!! Wowzers. If you have multi-targeting(3) you can shoot three times. If you hold still, you shoot 6 times!
Overwatch! If an enemy unit ends its move within 12″ of a unit with this ability, they can perform a defensive shooting action at them out of sequence
Relentless: can fire as if they held still, rapid fire to 18″ as opposed to 24″
Tiered stealth: +1. 2. 3 etc.
Swarms: eternal warrior (1), +1 evade, vulnerable to blasts
veiled: tiered level 1, 2d6x3 to spot, level 2 2d6x2, level 3 2d6x1.5 to spot.
Draw Back rule: performed in the consolidation phase, 2d6″ move after shooting: eldar jetbikes
In the consolidation phase (after shooting) you can join or leave a unit, embark in a vehicle(!), move or regroup.
You can oly regroup if you are not within 12″ of an enemy unit, but if you embark into a vehicle, you automatically regroup.
Patch up: bye bye wound allocation tricks! If you have more than one multi-wound model with a wound, take a wound from one and give it to another until only one model remains with less than full wounds! Peace out, Draigowing!
Defensive fire: you can shoot a unit that comes within 12″ out of sequence with this rule. Nice! shoot units as they assault you.
Charge by CHance: sounds like over-watch but for assault. If a unit appears within 6″ of the unit with this rule, it can assault that unit. Sounds like shooting a transport, blowing up it up, then assaulting the unit inside.
Rapid Fire: tiered rapid fire, if within 12″ you get one extra shot. rapid fire (2) gives 3 shots at 12″, 2 at 18″
assault weapons count as a secondary close combat weapon in HtH
Ordnance weapons take 2 fire actions to fire, ordnance barrage take 4 fire actions
“bomb” type weapons are fired in the movement phase
grenades can be used as weapons against massive type models (MCs!) or vehicles but your WS is 1
Directed Hits: attacker chooses what models take the wounds. Stopped by shielding units, or the shielded rule.
Grenade launchers halve the WS of the defending unit when attacking them with grenades
ID causes an additional wound even if the str value of the attack isn’t high enough to normally cause ID. Eternal warrior block ID if the tier is higher.
master crafted rerolls a miss, multiple master crafted weapons of the same type in the same unit reroll one miss per model with the rule (speeds things up a lot)
coarse weapon: only another coarse weapon may grant an additional attack and can’t be directed.
Blast weapons. Wow! Hit with BS as normal, if you miss, scatter the number x 2 (always scatters). So if you hit on a 4, you can only ever scatter 4″ max!
Template weapons: can shoot out 3″ from the firing model unless otherwise greater, if it hits the firing point of a vehicle or bastion, D3 models inside are hit! Can be fired in the turn you assault, hitting D6 times on the target unit at the weapons str and ap.
blast weapons hit as described above. Any model partially under the template gets hit at full strength (even vehicles). If the blast hits a vehicle, full strength to armor in firer’s facing. If not on vehicle, full strength to armor facing the center of the blast but -3 on the damage table.
Multiple blasts: fire one weapon as “lead.” Resolve where it lands, all secondary shots must touch the preceding template and hit as many enemy models as possible, moving towards the enemy unit if the shot missed. Wow. Faster, and much deadlier.
Rail Weapons: awesome! Target a model within range, even if not in LOS. Roll to hit as with a blast weapon. After final point is determined, draw a line between point and firing unit. All units under the line take as many hits as models under the line. Holy crap, this can rape tanks! A Hammerhead could theoretically hit as many tanks as are in a straight line and in range! Models out of LOS get a 4+. Multiple rail weapons resolve simultaneously, indirect rail weapons only grant a cover save if the unit is in area terrain.
Barrage: roll to hit as with blast weapon. If target is out of LOS you hit with BS, roll the scatter, on a “Hit” you hit. On an arrow you scatter double the die roll. On a BS miss, you scatter as normal.
Bombing is a free action done in the movement phase
AA weapons always hit target as if it were evade 3
Entangling weapons cause target to be in difficult and dangerous
pinning weapons cause cumulative morale checks to be pinned. -1 for each unsaved wound.
Snipers are finally legit! All sniper weapons are pinning, rending, directed hits! Wow, they can choose who they can hit! Finally.
Targeter: shooting unit makes target count as stationary for EV purposes.
Twin-linked template weapons increase their range to 6?. Wow, twin flamers now shoot farther instead of rerolling to wound.
Rapid fire weapons fire like assault weapons now, meaning they can always fire once out to max range, and an additional shot if within 12?. Nice!
Force weapons cause ID(2) so they don’t own monstrous creatures anymore. Thank goodness.
Power weapons now have the parry rule, which grants a 5++ in HtH! Awesome! A reason to take them.
Monstrous creatures now hit with a weapon that is 2xS, ap 2
All CCWs are ap6, which means Orks and Gaunts and such get no save from most HtH attacks.
whitcblades are str7, and can be “chanelled” activated with a ld test, to allow the wielder to reroll any failed invul saves.
Melta bombs finally have the melta rule and ap!
Psychic Hood: roll a D6 if within 24?, add mastery level, blocker needs to beat defender to stop power. Can’t be used inside a transport.
Infantry: 6? move, 12? run or charge
Beasts or Calvary: move 7?, charge 21?, run 14?
Jump Infantry: move 9?, charge or run 18?, deep strike
Flying Infantry: airborne, move 9?, run or charge 18?, deep strike
Jet Pack: move 6?, airborne, draw back, deep strike, 12? charge or run
Bikes: move 8?, charge or run 16?, fast, multi-targeting (1), jink, +1 toughness against shooting attacks only, more resistant to ID
Jetbikes: move like bikes, plus airborne, and draw back for Eldar
artillery: same as above but also crew, crew members are markers that represent firing models. take one away every time the vehicle suffers an unsaved glancing or penetrating hit.
Fortifications: same as above bu also hulk and immobile
special rule: covering fire: Character forgoes shooting to allow unit to have one directed shot if the unit rolls at least 3, 6?s to hit.
Characters allow their unit to regroup in the consolidation phase. No mention to minimum unit sizes.
Characters have directed hit rule in HtH and shooting!
Characters can either be a squad leader or an IC.
Squad leaders are really important. They determine characteristic tests, facing for shooting at vehicles, seeing if the enemy unit is in cover, point blank range, etc.
If squad leader dies, another model takes his/her place.
IC’s can not join vehicles or MCs/GCs unless they are of the same unit type.
Psykers can perform one “power” type action per level of mastery. Mastery goes from one to 6. Humans rarely exceed 3, Eldar or Daemons rarely exceed 5.
All psykers level 1 unless specified otherwise. 1 power per level, can’t be duplicate power unless otherwise specified.
Perils on 2 or 12, critical hit. No mention of rerolling successful invul saves.
Psyker squads are cleared up. One model counts as using the power.
Any psyker can attempt to stop a power, works on a 5+ so long as the defender is not in a vehicle and within 24?
No vehicles can go up levels in a building anymore, even walkers.
Terrain checks for every piece of terrain moved through.
Hitting a Vehicle in HtH is different. If vehicle moves, they are WS10, if they hold still, WS0.
“Tank” type vehicles get -1 to the damage table. Leman Russ, hoooo!
Super heavies: -3 on the damage table.
weapon destroyed is -1 to multi-targeting. Reduced to 0 can only fire one weapon. reuced to -1, can’t shoot.
Immobilized 2 times = dead.
Explodes is now d6? radius. All units in range, or that were embarked roll a d6 for as many models as were hit. On a 6, the unit takes a critical hit. Exploded vehicles leave no debris behind.
wrecks are a 5+, difficult, dangerous
hull breach: for every additional stunned or immobilized result in the same phase, the damage is 1 higher. Ouch.
skimmers that are immobilized hit the ground off their base, and models underneath move out of the way.
Sqaudrons: any stunned, shaken, immobilized result ignored on a 5+ with +1 for each vehicle in the squadron. If test is failed, each vehicle in the squadron suffers the result.
dangerous terrain=roll d6, on a 6, vehicle suffers penetrating hit. only invul save to stop
repair rules got WAY better: on a 5+, repairing model removes a shaken, stunned, immobile or weapon destroyed result. Or, can boost the vehicle with the same role to add a level of multi-targeting! Techmairnes and Techpriests just got waaaaay cooler.