Is Harmonix working on a new Rock Band game?

Bloomberg is reporting that Harmonix is looking to bring Rock Band to the PlayStation 4 and Xbox One. Rock Band and the plastic instrument games genre was oversaturated the market near the end there and a lot of gamers got rhythm game fatigue with all the versions coming out.

Well, a lot of time has passed and it could be up for a revival. Harmonix has released two DLC's recently for Rock Band 3, so this could be a way for them to test the waters a little.

The big question is if they do release a new version of Rock Band for the current generation of consoles, what about all the DLCs that folks have purchased in the past? Would there be a way to transfer that over or we out of luck and would have to re-purchase everything? 

I wouldn't mind a new Rock Band game for the PlayStation 4 and I think it would be fun to go back to playing that game with friends again.