Edit: I was told that this has been posted already but I can't seem to find the other threads. Feel free to ignore mine if you've seen the others.
Surprised no one has posted this here yet, but here's some new info about Blitz posted about an hour ago via Destructiod. A link is featured below.
All-American Rejects – "Kids in the Street"
Barenaked Ladies – "One Week"
Collective Soul – "Shine"
Elton John – "I’m Still Standing"
Fall Out Boy – "A Little Less Sixteen Candles"
Great White – "Once Bitten Twice Shy"
Iron Maiden – "Wicker Man"
Living Colour – "Cult of Personality"
P!nk – "Raise Your Glass"
Shinedown – "Diamond Eyes"
Tears for Fears – "Shout"
Shockwave - sends out a wave that scores on all notes it touches
Bottle Rocket - explodes and clears notes it hits on tracks
Point Doubler - 2x points
Bandmate - takes over a track and plays all notes for you
Jackpot - play absolutely perfect to earn 3X points, but flub up and lose it all
Pinball Note - keep a pinball bouncing to clear touched notes
Blast Note - blows up any notes it touches
Synchrony - switches tracks without breaking your note streak
Flame Note - burn everything with fire to keep
Runaway Note - chase a note to get a bonus
All copy/pasted from this article (I suggest reading it anyways because any Rock Band news is going to be interesting):