Two songs from the film -- "Break My Heart" and "Don't Tell Me" -- will be available for 80 / $.99 each on the Xbox Live Marketplace from February 3rd, and the PSN from February 5th. Come March 31st, the DVD release of Spectacular! will include a redemption code for a free download of the two songs, via the Rock Band music store.
Interestingly enough, this will be the second piece of Nickelodeon-derived Rock Band DLC, following the addition of music from Naked Brothers Band and Miranda Cosgrove. It's like a pre-teen musical invasion.