I know this source from the USC School of Cinematic Arts. We got to chatting about Star Wars and they let me know some interesting Star Wars news I was not aware of.
This person causally told me they are hearing:
John Williams is writing the new Star Wars Cartoon’s theme song. Part of the deal that brought Williams back to Star Wars also brought him on to do the themes of two television projects for Lucasfilm.
The theme is a new theme, not the traditional Star Wars theme we all know or piece reworked like The Clone Wars had.
That is the word at USC anyways. It was said like it was common knowledge, which it is not in our circles. They did not name Star Wars Rebels by name, but called it “the new Star Wars cartoon.” I feel it is safe to say the implication was Star Wars Rebels. I informed them this was news to us and they did not mind if I ran it as long as I did not name them.
This is just a rumor. Do not consider it official. Until Lucasfilm announces it, it is unofficial and a rumor. Keep checking StarWars.com for official Star Wars news. There is a chance the person who passed this news onto me is incorrect or heard it from a presumptuous person.
We have run a new story stating Michael Giacchino might be involved.