No idea, Creative Assembly signed the deal with
GW a few years ago but there was no news until yesterday when an email was leaked. I'm hoping that it's going to be the old Old World, not the new fluff that
GW are supposed to be doing, but if it follows all the other TW games then I'd say that all the major factions would be available, Empire TW had 11 playable factions. Probably things like Chaos Dwarves, Kislev, Border Princes and maybe Wood Elves would be AI.
"The guns have stopped because we are at last about to attack. Even our generals aren't mad enough to shell their own men, they think its far more sporting to let the Germans do it!"
Capt Edmund Blackadder, the Somme, 1917.