Gamedaily reports, in a new interview with Boston.com, Harmonix's VP of Product Development Greg LoPiccolo was asked if a compiling program that would allow a band to convert its songs into playable Rock Band tracks might be conceivable. He answered, "It is conceivable, and would be awesome. We continue to talk about this possibility. I can't commit to such a thing at this point, but would love to tackle it if we could find a way."
Of course, the idea of transforming Rock Band into a user-generated platform (a la LittleBigPlanet) where players could create and share/play each other's music could be truly amazing and could possibly represent the next step in the evolution of this music game genre.
Later on in the interview he comments that the team is "working on improvements that are obviously missing from the current version of Rock Band, as well as some crazy stuff that no one will expect, but promises to kick ass."