Simultaneous release with the console versions also officially confirmed:
Haunts works for Capcom for those wondering. Very reliable.
@Smedwicks @toddhunter @ultradavid @FishStix @tehrebound It's coming to Steam, yes, we'll be transitioning from GFWL to Steam.
@FishStix @tehrebound Yes the intention is to have them all launch at around the same time. Should have more deets on PC ver soon.