Wii owners will be happy to hear that Rock Band 2 will, yes WILL, contain downloadable content and online multiplayer features.
Unfortunately, it doesn’t seem that there will be a way to transfer Rock Band songs into Rock Band 2 on the Wii title. There’s also the 500 pound gorilla in the room that is the Wii’s limited storage.
“Songs will be pulled from your internal memory on Wii, and additional songs can be purchased in the Rock Band store and saved to your SD card if more space is needed, but you’ll need to have any songs you want to play during that play session on your internal Wii memory. So on one hand you’ve got an extremely ambitious DLC offering from EA – a huge win for Wii fans – and on the other you’ve got Wii’s technical limitations (at least for the time being), which ensure that you’ll be cleaning your fridge out constantly if you want to keep updating your list of available DLC.”
Still. Not much you can do about that. The online features are key, though, so kudos to EA for getting that stuff implemented.