Now that Blizzard's finally announced Diablo 3, ending a feverish period of second guessing and rampant speculation, one thing is clear: Despite how you may feel about the big reveal, the specter of Diablo 3 can finally be laid to rest. Waiting in the wings, however, is ... what?
Starcraft 2 is in process, so it's extremely unlikely that Blizzard would dilute that audience by announcing a Starcraft MMO. Ditto with a Diablo MMO, and we don't even know what its release date might be. World of Warcraft has Wrath of the Lich King coming (probably) next year. Can we assume that the next announcement will concern their "next-gen MMO"? Is that project the oft-mentioned "Hydra"? With two active fantasy titles and one science fiction game, what could the next big thing possibly be?