5/4/16 - MKIII Forum Spoilers

All - Artillery now can Move and Fire. They removed Range Finder but allowed them to Aim.
All - "We amped up the effectiveness of battle engines across the board to better anchor them to their point costs, which I think average around 18 points. You won't see them in every list, but when you do they will have an impact."
All - FA of Artillery is still 2

Legion - Shredders have Adelphophagy (if a Shredder frenzies, it'd go after the nearest Shredder within LOS.) and Flank [friendly Faction warbeast]

Menoth - Sunburst -  "With an effective RNG of 20" we reduced its SPD to 2 and took its POW down a point to 15. Everything it hits gets continous fire.

Khador - Field Gun gets knockdown on its shots and costs 4 points
Khador - Picks up High Explosives: "Blast damage caused by this weapon is POW 10."

Ret - Ret Rifle team is POW 8 and keeps Range Finder which provides a boost to hit.

Cygnar - Trencher Cannon lost AD and picked up Brutal Damage and dropped its ranged to 13.

Cryx - Revenant Cannon Crew lost Ghost Shot for Bale Fire (Boosted against living models)

Mercenaries - Commodore Cannon can now be taken by all Privateer Warcasters
Mercenaries - Deck Guns - Reposition [3] and cost 3 points

Skorne - Venator Flayer Cannon - "Its ROF is still d3, but it gains a hot if the Grunt is B2B with the Gunner. It also POW 13 for RNG 12. That gives it a 15" threat if it moves and fires. "

5/2/16 - MKIII Forum Spoilers

You can read all the new Legion spoilers on the 5/2/16 Insider. As far as Forum Spoilers go:

Legion - Ninja Star icon on Proteus is Souless
Legion - Eyeless sight still ignores Stealth
Legion - Vayl 2 lost Purification and gained Chasten
Legion - Vayl 2 lost Obliteration and gained "Deadly Storm" whic is POW 13 that leaves a cloud effect for 1 round
Legion - Tenacity is gone
Legion - Lylyth 2 no longer has Shadow Pack

4/28/16 - MKIII Forum Spoilers

All - You can still charge if you have a speed debuff
All - Most Warcasters/Warlocks will have magical weapons
All - It is still possible to intentionally fails a charge.
All - It is also still possible to fire an AOE at a target out of range with the intention of scattering the shot.
All - You cannot charge friendly models any more.
All - You can still slam friendly models

Cryx - Witch Coven will keep their separate activations
Cryx -Excarnate now reads, "When a living enemy warrior model is boxed by Excarnate, remove it from play. You can then add one Grunt to a friendly Faction small-based undead unit in the spellcaster’s control range. Place the Grunt in formation and completely within 3˝ of the spellcaster. The Grunt must forfeit its Combat Action the turn it is put into play."
Cryx - The Leviathan is ROF d3.
Cryx -Venethrax: Field Marshal [Counter Charge]
Cryx - Deathbound: "If there are fewer models in this unit in play during your Maintenance Phase than there were at the start of the game, you can return d3 destroyed models to this unit. Place the returned models completely within 3˝ of the unit leader."
Cryx - Revenant unit cost 10/17.
Cryx - Rengrave picked up Cleave and Gang Fighter but lost Point Blank and Ghost Shot. Sac Pawn was traded for Call to Sacrifice [Revenant] ("If this model is disabled by an enemy attack, you can choose a non-disabled friendly Revenant model within 5˝ of this model to be destroyed. If another model is destroyed as a result of Call to Sacrifice, remove 1 damage point from this model.). Finally, a model put in play as a result of Death Toll must forfeit its Combat Action the turn it is put into play. All and all, I think a stronger and more fun Rengrave with a cost of 5.
All - Veteran Leader has been reduced to a +1 benefit but models just need to be in the Veteran Leader's command range now, the LOS requirement has been dropped.

Convergence - Reconstruction (★Action) now says, "Remove one soul token from this model to return one destroyed medium-based friendly Faction Clockwork Vessel Grunt to play, or remove up to three soul tokens from this model to return one destroyed small-based friendly Faction Clockwork Vessel Grunt to play for each token removed. Place each returned Grunt completely within 3˝ of this model, in formation, and within 3˝ of another model in its unit. A returned Grunt must forfeit its Combat Action the turn it is put into play."

New 4/27/16 Insider Spoilers

New Scenario - Rumble will be a new 30" x 30" scenario for people who have smaller tables. Players only deploy their Advanced Deployment on turn 1 and on Turn 2 they deploy their main force. This will prevent Turn 1 assassinations.
All - More Terrain! Instead of the 5-7 pieces, Steamroller 2016 will have around 6-8 pieces
All - Terrain placement will be less restricted in terms of distance between each other and objectives
All - Terrain placement will be tighter and can't be placed on the edges of the board.
All - No more Toe-ing into terrain (forests/hills/clouds). You need to be completely within to gain the benefits.
Minions - Wrong Eye will be getting Star Crossed
Minions - "Arkadius' needle got some nifty upgrades, and he doesn't just stick enemy models with them anymore. I mean, one of his options is to fill one of his own warbeasts with Raw Adrenaline, which reads: If a living warbeast is damaged by an attack with this weapon, all attack and damage rolls resulting from its next basic attack this turn are boosted."

Official MKIII Spoilers for 4/21-4/22 from PP Employees

Here are the official MKIII spoilers for 4/21 - 4/22 from PP employees:

All - Cavalry FAs are now 2
All - Non-Character Cavalry Solos are FA2
All - Cavalry will have Reposition[x] which will allow them to move after activation
All - Solos FAs mostly remain the same
All - Tough is still 5+ but only works when you're standing
All - Rate of Fire is how many intial attacks you get, you don't need to buy them
All - Reload [x] will be the number of extra shots you can buy
All - No more Tiers to unlock. Themes will work like MKII Mercenary Contracts
All - Standard bearers give +2 to Command Range
All - Most units will be FA U
All - Most Heavy Infantry will have only 5 Damage boxes

Hordes - Lowered THR stats so more Frenzies
Hordes - Conditioning only removes or adds 1 Fury now

Cygnar - Iron Clad is 12 Points and his hammer does damage then knocksdown everyone in 4" template

Trollbloods - Krielstone Bearer is essentially the same other than point cost
Trollbloods - Long Riders are the sturdiest Cavalry in the game
Trollbloods - Champions retain no-knockdown while b2b
Trollbloods - Warders have Shield Guard
Trollbloods - Farstrike will only be SELF and will be cheaper
Trollbloods - Trolls will have a better ranged game

Menoth - Reckoner's Flare removes Stealth
Menoth - Many of Menoth Warjacks got +1 MAT
Menoth - Crusader is the same but at 10 PC and Range 1 Melee
Menoth - Redeemer is 11 Points - It makes 3 free skyhammers shots, no focus required

Circle - Tharn Ravager Chieftain, mini feat: Mass Carnage, Overtake for a turn. Granted: Vengeance.
Circle - Skinwalkers more defensive.

Khador - Conquest: High Explosive POW 10 AOEs on secondary batteries.
Khador - Man O Wars massively retooled. Most durable Heavy infantry in the game. eight damage boxes.

Khador - Shock Trooper officer coming. Makes them an immovable wall. Can't be moved or knocked down. Now repairable.

Legion - Proteus is going to be good
Legion - Archangel - Speed 7, can move outside normal movement with Deceptively Mobile (Advance 3" if you don't run or fail a charge)
Legion - Archangel RAT went up to 6

Skorne - Agonizers are now Lesser Warbeasts
Skorne - Feat: Blackout: Enemy models currently in Morghoul’s control range and LOS suffer Blind for one round. (A model suffering Blind cannot make ranged or magic attacks, suffers –4 MAT and DEF, and cannot run, charge, or make slam or trample power attacks. It must forfeit either its Normal Movement or Combat Action during its next activation. Blind can be shaken.)

Cryx - Necrotech - When a warjack is destroyed in this model’s command range, it gains one scrap token. This model can have up to three scrap tokens at any time. Before making a Repair roll, this model can spend one scrap token to add +2 to its roll.

Create Scrap Thrall (★Action) - When this model uses this ability remove one or more scrap tokens from this model, then roll a d3 for each scrap token removed. Place up to that number of Scrap Thralls into play completely within 3˝ of this model. A placed Scrap Thrall must forfeit its Combat Action the turn it is put into play.

Retribution - Thyron isn't going to be the only Ellowuyr swordsman on the table. He's going to have a whole mess of friends real soon to show those snobby Dawnguard who the real sword masters are.

Convergence - There are new Convergence Models in the works

Minions - Wrastler has the Rage Animus (+3 Strength)

Mercenaries - Shae will be able to take Kayazy Assassins