A trailer has been released for Rock Band: Green Day. Though official confirmation came only this past weekend, the game has been a poorly guarded secret since at least June. It's worth noting that while the producers of Guitar Hero, Activision, have released numerous band-branded games from Aerosmith, AC/DC, Van Halen and Metallica, the Rock Band makers have only done a single band specific title, the acclaimed game from The Beatles.

A MTV article shed some light on the title:

The game will feature the likenesses of Armstrong, bassist Mike Dirnt and drummer Tre Cool and allow fans to play songs from the group's catalog, visit venues and view artwork that is key to their history. With a fully exportable track list that will allow users to play the songs in "Rock Band" and "Rock Band 2" on the Xbox 360 and PlayStation3, the game will be available around the world for the 360, PlayStation3 and Wii next year.

A trailer featuring the title track from American Idiot introduced by the real Green Day and performed by Green Day avatars is available.