Even though a set list is not yet available, it has been announced that Guitar Hero II will be released in November, with at least 55 playable. No word yet on whether they will all be hit songs, or whether some of those will be from independent artists, like in the current Guitar Hero, which has 30 classic tracks, and some number of additional no-name tracks.
One of the fantastic additions to Guitar Hero II will be expanded multiplayer. In the current game, if two people play together, they either alternate playing the lead, or play it simultaneously. In the second game, there will be an additional music track for each song. For some, it will be rhythm guitar, and for some, it will be bass. You can then choose ahead of time which person will be playing lead, and which will be playing backup. I sent an email requesting a Bass Hero game a while back, so it sounds like somebody listened to me!
Oh, and I heard elsewhere that they are expecting to release five or six Guitar Hero games between now and next year, including the possibility of themed games, á la Karaoke Revolution Country. For my money (literally!), the more games, the better.
You can read the entire interview with the game’s creators for more information.