[kasey2004]

googled it and got a list of tracks "confirmed" for GH 3...

Not sure how reliable but here ya go

* Paint It Black (by The Rolling Stones)
* Cherub Rock (by Smashing Pumpkins)
* Sabotage (by Beastie Boys)
* The Metal (by Tenacious D)
* My Name is Jonas (by Weezer)
* Knights of Cydonia (by Muse)
* Rock And Roll All Nite (as made famous by Kiss)
* School’s Out (as made famous by Alice Cooper)
* Slow Ride (as made famous by Fog Hat)
* Cult of Personality (by Living Colour)
* Barracuda (as made famous by Heart)

Also found:

Battle Mode

IGN announced the game would feature a new multiplayer game mode called Battle Mode.[16] The mode puts a twist on the traditional Pro Face-off mode introduced in Guitar Hero II. Two players will face each other, trying to complete a song while successfully playing Star Power sequences to earn power-ups that can be used against their opponents. Players will be able to store 3 power-ups at a time and can activate them by tilting their guitars upward. If neither player fails the song, they will face each other in a sudden death segment. The power-ups will include:

* Broken string: One button on the opponent's guitar will not work until it is fixed (by rapidly tapping the button).
* Difficulty up: The opponent will play the song on an increased difficulty for a short duration of time (except for expert difficulty).
* Amp overload: The fret board will shake and appear blurry, making the scrolling notes difficult to read.
* Whammy bar: The opponent will have to use the whammy bar before he/she can play notes again.
* Steal power: This will steal your opponent's power-up.
* Double notes: The opponent will have to play twice as many notes for a short duration of time.
* Lefty flip: The fret board will be mirrored, requiring the player to switch their handedness on the guitar.


I personally would love to see some Metallica and AC/DC