Well, Rock Band 2 DLC is coming eventually. It will most likely work in a similar way to the Guitar Hero: World Tour system. Harmonix is taking it a step further, though, and plans to release a Rock Band 2-branded SD card. The card will have 2 gigs of space and will cost $12.99.
So just how much is 2 gigs in Rock Band terms? It’s estimated that the average Rock Band song will be around 24MB in size, so it should hold just over 80 songs if you use it exclusively for that. It appears to be a standard SD card with a pretty Rock Band 2 sticker on it, so you can use it for things like WiiWare backups as well. That also means you can just use any old SD card you happen to have lying around for storing your tunes. Thus is the magic of flash memory.
