If Diablo 3 is an MMORPG then Blizzard will no longer be my favorite PC developer, if they stick to the singleplayer action-RPG with optional online they'll have a KILLER hit on their hands, apart from WoW, everything Blizzard makes is pure gold, that's why their developments cycles are so insanely long.
Also this might mean nothing but check out the new job posting for Blizzard:
" Hot Job ?
Lead 3D Environment Artist
Blizzard Entertainment, the developer of Diablo and Diablo II, is looking for a lead 3D environment artist skilled at creating models and texture maps for both architectural and natural environments. The ideal candidate has experience modeling and texturing assets for a diverse visual range of environments.
Take a look at the job posting here. "
Take notice where it says, developer of Diablo and Diablo 2, there are much better known games made by Blizzard out there, why specify Diablo?