Even though Guitar Hero: Aerosmith is barely off the tour bus, Activision has already announced a second band-centric Guitar Hero game: Guitar Hero: Metallica. The news was buried deep within an Activision financial report from the weekend, though details are sparse -- all we know is that the game will release during the current fiscal year (which ends on March 31st, 2009), and will "likely follow" the release of Guitar Hero: World Tour. Whether it will use the various instruments that World Tour will introduce is a mystery, as are which platforms it will appear on.
It's not the first time that the

