The festival being this booked up already is simply impossible. About MAYBE a quarter of that will be true, but as Ravenheart said, those are kind of predictable anyway.
With regards the Pantera reunion. I'd give any amount of money for it to happen, but I really don't see it being so. Down are just about to release and get back out properly touring again, so we might get some Vinnie, Rex and Phil on stage jams if their respective bands do festivals together, but an actual reunion is pretty much impossible, in my opinion.
Yesterday don't mean SHIT.