Ever since this screenshot was found on the Darkest of The Hillside Thicket's lead singer's blog (which shows Shoot To Thrill (Live at Donington)), folks have been excited to know that more AC/DC will be coming to Rock Band.  Now the rumors have picked up even more, as Destructoid posted  this image  from a Wal-Mart stock listing that states "Rock Band 2 Video AC/DC 'Live at Donington' Expansion Pack for Rock Band 2."  Wal-Mart wouldn't stock DLC, so this would seem to be an add-on disc for Rock Band 2.  Given that Rock Band's entire strategy is built around having one game with hundreds of songs, this seems like a strange move.  My bet is that the disc is for Wii/PS2, and the expansion will be available as a download for the 360/PS3.

Let's hope, anyway.  I'm done buying discs.