Right now, there's a PC version of Diablo III planned. A Mac version, too. But consoles? According to Blizzard, as of August 2010, there are no plans for a console version of the game.
At a Q&A session earlier today, Blizzard's Jay Wilbur took to the podium to answer a bunch of questions, and that was one of them. Sorry, PS3 and 360 owners. Then again, the game probably won't be out until 2016, there's plenty of time for Blizzard to develop some plans!
The rest of the session was taken up with a discussion of some of Diablo III's new features, including the new "artisan" characters (you get a guy following you, and they're the ones whose crafting levels up, not yours) and the fact there'll be a hardcore mode: as in, if you die, you really die, and no matter how far into the game you are, that's it.