well, these are the songs released officially:
2000s:
Metric, “Combat Baby”
Rilo Kiley, “Portions for Foxes”
Them Crooked Vultures, “Dead End Friends”
The Vines, “Get Free”
The White Stripes, “The Hardest Button to Button”
Phoenix, “Lasso”
Ida Maria, “Oh My God”
Juanes, “Me Enamora”
1990s:
Jane’s Addiction, “Been Caught Stealing”
Smash Mouth, “Walkin’ on the Sun”
Spacehog, “In the Meantime”
Stone Temple Pilots, “Plush”
1980s:
Dio, “Rainbow in the Dark”
Huey Lewis and the News, “The Power of Love”
Joan Jett, “I Love Rock and Roll”
Night Ranger, “Sister Christian”
Whitesnake, “Here I Go Again”
The Cure, “Just Like Heaven”
Ozzy Osbourne, “Crazy Train”
1970s:
Queen, “Bohemian Rhapsody”
1960s:
Jimi Hendrix, “Crosstown Traffic”
The Doors, “Break On Through”
all DLC from all previous Rock Band games will be compatible, no word on if they will be upgraded with 'pro' mode or if songs from the original RB and RB2 games themselves will be compatible though.