UPDATED Metallica Tease ‘Big 4′ US Dates

Update: The tour dates will be announced tomorrow at 8 a.m. PST. Metallica has uploaded a picture onto their website that teases us with the possibility of ‘Big 4′ tour dates. The ‘Big 4′ is a combined tour of Metallica, Slayer, Megadeth, and Anthrax. The four bands played several Sonisphere shows in Europe and a DVD of one such performance is available here
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What do you guys think? Is it gonna be a full US tour or just a few select dates? I’m not sure I can see these guys being on the road together for an extended period of time without old tempers flaring and B.S. flying through the air.