Apparently there has been some confusion about the downloadable content for the Wii’s version of Rock Band 2.

Harmonix’s Sean Baptiste has posted a quick response to the confusion in the official forums for Rock Band 2. According to Sean, "the DLC is in the final testing stages and they are working on it as fast as possible on the 20 free bonus songs, and an additional 30 songs as early in 2009 as possible. As soon as we can announe a firm date, you can be sure the Rock Band community will be the first to know"

So if you were confused about this hopefully this clears it up for you.