Not sure if this has been revealed yet, but there's a Rock Band DLC schedule for March:
3/4: Blinded By Fear - At the Gates
Thrasher - Evile
Shadow World - Haunted
3/11: Shooting Star - Bad Company
Simple Man - Lynayrd Skynyrd
Message in a Bottle - Police
3/18: March of the Pigs - Nine Inch Nails
The Collector - NIN
The Perfect Drug - NIN
3/25: Wrathchild - Iron Maiden
Supernaut - Black Sabbath
Fuel - Metallica