Sooo more Brisingr stuff, Galbatorix knowing the entire ancient language, and more dragons? You're right. That's actually kind of a given.

Also, you don't need to worry about spoiling anything because at this point none of it is fact, it's just a theory. And the movie has been out and hated long enough not to need spoilers.

I don't see why a hermit with an almost unheard of ability to use magic without the use of words wouldn't make another appearance.

Edit: It's called Inheritance.