No, Diablo III
hasn't been announced for the console just yet but that hasn't stopped Blizzard from teasing it a little. Game director Jay Wilson talked with PC Gamer
a little about using an Xbox 360 style controller with the game.
Jay says the game feels even better with the direct control given when using a console controller. Blizzard would also add control pad support to the PC version, but this brings up a possibility of an Xbox 360 or PlayStation 3 version later on down the road.
Now Diablo has been on the console before with a PlayStation port of the original game, so this isn't anything new for Blizzard. It's just a nice option for those that don't have the PC power to play the game.
By the way, you can read Chuck's thoughts
on his time with the public beta that's out now.