So, found this on Metallica's official MySpace (http://blog.myspace.com/index.cfm?fuseaction=blog.view&friendID=4689215&blogID=402317454):
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METALLICA GUITAR HERO GAME. . . FACT OR FICTION?
An all Metallica Guitar Hero game . . . fact or fiction? Idle internet gossip, wishful thinking, or the real deal? Let's just say that perhaps, just maybe, if you've already mastered "One" on GHIII there might be a pile of 'Tallica songs in your future.
More details later this summer . . .
So, thoughts? I'm probably going to buy it.
I'll be buying it. Should be awesome.
By the way, there is already another thread about this.