At the MS E3 briefing Activision reveals that Guitar Hero: World Tour will exclusively feature Van Halen and The Eagles, and will also offer downloads of an exclusive REM track pack. They will also offer downloads of the GH edition of Death Magnetic simultaneous with the release of this new Metallica album in stores. The Metallica release will be for Guitar Hero III and Guitar Hero World Tour, but it is not clear if a separate purchase will be required for each game. Presumably this means rumors of a Guitar Hero: Metallica in the vein of the recent Guitar Hero: Aerosmith are inaccurate. Here's some more of what Microsoft announced at today's press event:

• The "first downloadable episode for Grand Theft Auto 4 later this year." Contradicting rumors this would be delayed to 2009.
• Final Fantasy 13 will be making its way to the Xbox 360. "At long last," a first for the series.
• A whole new Xbox 360 interface, with Mii-like avatars and enhanced social features. More here.
• Geometry Wars 2 is coming next month as an Xbox LIVE Arcade exclusive.
• Galaga Legions, called a "true sequel" to the original, which was in arcades over 20 years ago. Also a LIVE arcade exclusive due next month.
• Some sort of South Park game was teased in an odd manner.
• Lips is announced, confirming rumors of an upcoming Karaoke game.
• A Netflix partnership.