Rock Band DLC will be two track packs that are all Queen. One pack includes some Rock Band 3 upgraded tracks from Lego Rock Band, along with some lesser-ish known ditties, while the other is an extrabonanza of the band's most popular songs (which you might already own) reworked for RB3. That means: harmonies!
So, if singing like Freddie Mercury wasn't already hard enough, you're really gonna have to work as a team to nail those tracks properly. You are the champions, my friends. The full DLC track details are posted after the break.