Harmonix's upcoming non-instrument controller using Rock Band game, Rock Band Blitz, finally has a release date and price. According to this official announcement, the game will officially arrive on PlayStation Network August 28, and Xbox Live August 29. It will retail for $14.99 and 1200 MSP respectively.
Harmonix also announced four new songs for the 20-plus song soundtrack. Here's the whole soundtrack thus far, with the new songs in bold.
Of course, those 19 songs (and whatever other ones Harmonix announces before the release date) will join any Rock Band downloadable tracks you already own as playable songs in Blitz. Likewise, you'll be able to play any of the above songs in Rock Band 3 as regular DLC. Hell, I'd pay $15 just for "Jungle Boogie" and "Jessie's Girl," but maybe that's just me.