Could it be SC3 as they have said it will be a trilogy(at least I think so). A Diablo RTS I don't know how that would work at least I cant think of a way. I would hope it be the revival of Starcraft: Ghost but who knows.
D3 MMO would be cool and very interesting how they would put it together. Also a WC4 would be great. WC3 was amazing and I still can't get enough of it even with all the good games out currently(Except Dota hate that game!)
Maybe its DiabloIV?
Maybe its an expansion for DiabloIII? Oh the possibilities!
but a Diablo MMO would be damn fun. I remember talking to maggie about it, and if Blizz did it right, a Diablo MMO could be very sexy.
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I would imagine the Diablo 3 team will be working on the Diablo 3 expansions that will be made (I know that the team for WoW does all their expansions and that game is much more grand in scale). I'd love to see WC4 too, that's what I'd guess, unless they've got some new IP. I expect Blizzard to come up with an awesome game, no matter what.