Do Activision still have the rights to Metallica? Harmonix had to remove their Metallica tracks from Rock Band because of it.
The short answer on that one is we honestly don't know right now. Activision's contract with Aerosmith expired shortly before RB3 shut down, and on top of that, every piece of GH DLC was removed from purchase due to Activision letting their licenses expire. That being said, we won't know for sure until any tracklist announcements get made.