According to an interview with MTV's Multiplayer, World of Warcraft game director Jeffrey Kaplan is “definitely involved” in a next-gen MMO, and it may even come to consoles.
“I don’t think World of Warcraft would really work that well on the console,” Kaplan said, “but that’s not to say that other MMOs couldn’t. And we have a pretty savvy group of console developers — a lot of the guys we inherited from Swingin’ Ape really know what they’re doing on next-gen consoles. So we might have a few tricks up our sleeves in that regard.”
So a Blizzard-produced MMO might be coming to consoles--amazing--but what kind of game will it be? Kaplan is keeping quiet. MTV asked if the unnamed MMO would be "sci-fi, near-future, post-apocalyptic or historical" and Kaplan responded “All of those combined!”