It is rumored that Ozzy might be playing BlizzCon with guitarist Gus G instead of Zakk Wylde. It still seems lame that Ozzy is not telling long-time guitarist Wylde what is going on, but Gus G would be a good choice for a replacement.
He is a badass guitarist that might provide a breath of fresh air in Ozzy's career. Check out his work with Firewind below.
Imagine if Ozzy kepy Wylde and also got Gus G as a second guitarist. That would be insane, although I don't think Wylde and Gus G's styles match-up.