The first details of the just officially announced, Lego Rock Band, have just released! An Xbox.com listing for the game indicates that the progression system will stay true to the Lego environment. You’ll attain Lego’s, in which you can, “build cooler vehicles and move to new venues”.

Perhaps the most important piece of information, is the fact that you can import Rock Band 2’s music catalog into Lego Rock Band.

Via Joystiq