Taken from NEOGAF:

Apparently, Activision just announced three more tracks for the game:

Anthrax - Madhouse
Motley Crue - Shout at the Devil
Stone Temple Pilots - Tripping on a hole in paper heart

With the already announced list being:

Drist - Arterial Black
Black Sabbath - War Pigs
KISS - Strutter
Rush - YYZ
Reverend Horton Heat - Psychobilly Freakout
Van Halen - You really got me
Butthole Surfers - Who was in my room last night

The best song they could get from Anthrax is Madhouse? That's pretty crappy if you ask me. The Motely Crue song makes me happy though.