Basically what people do is add a song name to the URL (www.rockband.com/songs/...), & that every-once in a while uncovers unannounced Rock Band 3 DLC. Here & Here are what they found this time. Or here is the breakdown:

Red Hot Chili Peppers songs: The Adventures of Rain Dance Maggie, By The Way, Californication, Look Around, Monarchy of Roses, Otherside, Parallel Universe, Scar Tissue

Fall Out Boy songs: Dance, Dance; Sugar, We're Goin Down; Thnk Fr Th Mmrs

Unbelievable re-recording by EMF

Pearl Jam songs: Animal (Live), Better Man (Live), Brain of J. (Live), Breakerfall (Live), Comatose (Live), Crazy Mary (Live), Daughter (Live), Do the Evolution (Live), Even Flow (Live), The Fixer (Live), Got Some (Live), Green Disease (Live), Hail, Hail (Live), I Am Mine (Live), In My Tree (Live), Life Wasted (Live), Low Light (Live), Marker in the Sand (Live), Porch (Live), Red Mosquito (Live), Rockin' in the Free World (Live), Severed Hand (Live) Spin the Black Circle (Live) Who You Are (Live) World Wide Suicide (Live) Yellow Ledbetter (Live), You Are (Live)

If any of this pans out, Otherside and Californication would be pretty cool.

Awesome pearl jam list. Hoping the lyrics for yellow Ledbetter are just question marks

Yes!  I can't wait to get the Fall Out Boy songs, although I'm probably the only one who's excited for them.

give me pearl jam!!!

I would KILL for Californication, been waiting for that for 3 years. Otherside would also be great. Californication is one of the few songs I know on actual guitar

@TepidShark: I'm presuming you frequent the RB forums? What's your username out of interest?

OT: Still waiting for more Flaming Lips and some Beta Band :(

Other Side and Parallel Universe would be must-buys for me :)

OH PLEASE LET THERE BE MORE RHCP! Thats a good list of rumored songs.
Oh, and my friend will be excited for more Fall Out Boy.

@GS_Dan: Same as on GiantBomb/Whiskey Sites.

Ew, Fall Out Boy.

Ew, Fall Out Boy.

@fallout67 said:

@TrippinBungalow said:

Ew, Fall Out Boy.

what's wrong with fall out boy

He just can't keep up with Radioactive Man

Oh god, how did I miss this?!

Pardon my French, but... Holy fucking shit Pearl Jam! :D :D :D :D :D :D :D :D I can't possibly post enough faces to convey my excitement.

I knew this would happen. God, happiness. So much happiness. You guys don't even know. And I needed some happiness right about now, too. Fantastic news.

God dammit, now I need money. Lots of money.

Yes!  I can't wait to get the Fall Out Boy songs, although I'm probably the only one who's excited for them.