Maybe they already have; neither company will confirm or deny this. Of course, this would be major, as Vivendi own Blizzard. I would expect this would be Diable II would be available for the 'box! That would rock supremely!
I have the original Diable for Playstation, and it's one of my favorite all time games. I've played it thru completely dozens of time, and spent literally thousands of hours one it. I'm actually planning to fire it up for a couple hours later on tonite.