Jeffrey Kaplan Working on Unannounced Blizzard MMO

Jeffrey Kaplan reveals to MTV Multiplayer that he's working on the unannounced MMO, while also hinting at possible future console titles from Blizzard.
(I think the great part about a new MMO from Blizzard is that it doesn't have to be '˜WoW',) he said. (There are a lot of lessons we learned in making '˜World of Warcraft,' and some of those you can take and do things better than you ever did before.)
(...)
He thought the secret to success was making a game that was both tailored to hardcore players and accessible to a broad audience. (Once people figure that out, your game world is going to attract a lot of people,) he explained. (But a lot of it has to do with art style, too. Are you going for realism or an inviting world? And once you learn those lessons, I think any type of [intellectual property] can survive. I'm shocked we haven't seen more sci-fi, near-future, post-apocalyptic, historical MMOs; there's all these completely different fantasy settings beyond the traditional high fantasy ones.)

So is Blizzard's new MMO going to be sci-fi, near-future, post-apocalyptic or historical? (All of those combined!) he said, laughing.