Blizzard Reveals "Unannounced Diablo Project"

The Blizzard Careers Website reveal that Blizzard is working on an unannounced Diablo project. They now have job listings for Dungeon Artist, Diablo and Environment Artist, Diablo, and each is listed under the heading of "unannounced project." Both listings talk about working in the Diablo environment, and come right out and say why right up top:
The minions of Hell are growing stronger...

We're working on a new, unannounced Diablo project.