A little less than 48 hours ago, Twitter user @TaNGoIX Tweeted this message to Bashiok, Blizzard Entertainment's Community Manager:
@Bashiok can you confirm or deny Diablo 3 coming to consoles? Thanks.
@TaNGoIX Yup. Josh Mosqueira is lead designer for the Diablo console project.
Bashiok did not reveal which consoles it will appear on nor a release date, but rest assured that 8bitfix will be here with up to the minute information as it is released.
Source Bashiok's Twitter