http://us.battle.net/d3/en/forum/topic/5978861022?page=1
Basically, what's happening, is Diablo III's anti-cheat system is detecting WINE as a third-party program, and banning users with it on their computer. So, basically everybody who uses Linux. What's even worse, is this is getting a lot of attention and Blizzard hasn't given a single response. Any attempts at a support ticket result in "No, you were using a third party program, kthxbye."
I'm really not surprised, considering Blizzard merged with Activision.
Thoughts?