The rumors are flying these days about upcoming RIM releases, be it devices, OS', or applications. The latest word going around is that RIM is working on a social music platform, possibly to be called BBM Music. Utilizing the new BBM Social Platform, BlackBerry users would be able to share music and playlists with other BBM users. Shared music could then be downloaded directly to the BlackBerry via the stand-alone app.
This makes sense, since there is already some integration with music and BBM with the "now playing" option in BlackBerry Messenger - why not take it a step further, integrate it completely and allow for sharing too. Sounds like a great application! Details are slim as of now, but hopefully we'll hear more soon.