As alluded to above, GD:RB will also sport the same vocal harmonizing feature that made The Beatles: Rock Band such a delight for mic hogs and comes loaded with 47 Green Day tracks, including "Brain Stew," "Jaded," "Hitchin' a Ride," "American Idiot," "Wake Me Up When September Ends" and "Boulevard of Broken Dreams."
Oh, and if you're looking to export these tunes, worry not: all 47 tracks are fully exportable to a console hard drive and playable in Rock Band, Rock Band 2 and the recently announced Rock Band 3. The export fee is $9.99 via Xbox Live or PSN. The export features is not available for the Wii system. Additionally, if you've picked up the six Green Day tunes already available as DLC, you can play them in the new game with added harmonies, "unique" visuals and more "exclusive archival material."
Green Day: Rock Band will be available as a standalone game for Xbox 360 and PS3 for $59.99, while Wii owners will get a bit of a price break at $49.99. A special edition Green Day: Rock Band Plus will also come to Xbox 360 and PS3 for $69.99 and includes fancy packaging, an "export" feature (we assume, a voucher to export the disc tracks to the hard drive) and the six previously released Green Day DLC tracks.
Update: The GameStop pre-order bonus for the standalone game is an export voucher (for Xbox 360 or PS3). Essentially, pre-order GD:RB from GameStop, and you can export all 47 tracks to your console hard drive for free.