Wait...didn't Blizzard specifically say in multiple places a while back that they planned to close off the Diablo universe with the second game so as to avoid it getting too done-to-death (i.e. EA-ized?)
Then again, Roper & gang are currently creating something that can be seen as the next-gen Diablo (Hellgate), so unless Blizzard wants to lose a large portion of its Diablo playing customers, they're almost bound to come up with a new one.
And with all the departures from blizzard over the past two years or so, I doubt that there's a lot of innovation left, so perhaps EA-izing is all that's left for them. Starcraft Ghost really doesn't look much more than a plain bog standard console shooter.
Creston