Harmonix is set to rollout version 2.0 of the Rock Band Network, which allows users to create and upload their own music.
While this is good news, it also comes with a bit of bad as well. The switch to 2.0 means that the former version will no longer function, and that all songs currently being made with 1.0 will need to be published before February 14, and submitted no later than January 28.
Not only will you need to upgrade to version 2.0 to keep making eligible RBN songs, but you’ll also need to make the jump to Rock Band 3, assuming you haven’t already.
[Source]