Quote fromThe first act is a little bit more of a mystery, there's this cult that has been operating in and around the rebuilt Tristram, you're trying to find out who they are. Act two's a little bit more of an intrigue and deception-focused story, because Belial is in there. Act three, there's a lot more.
So could Belial, like some have guessed, been posing as Tyrael to destroy the Worldstone?
Also a 5th class tidbit:
IGN: Have you confirmed how many unrevealed classes there are, to round out the entire party?
Jay Wilson: There's one more.
IGN: You did mention that it's being revealed next year, and that it's someone from the previous games?
Jay Wilson: I did say that. I probably shouldn't have said that, because we're not sure that's going to be the case. It's just logical, that's what we tend to do. But it may or may not. I'm not gonna answer it, anyway? [laughs]