Joss is heavily involved. Dark Horse was prepared to have limited Joss involvment in season 9. They were trying to figure out the logistics of keeping Joss happy but not make huge demands on his time. But Joss said, what happens to Buffy is too important to him and he wants to be directly involved and writing for season 9. Writing for Buffy is a release for Joss with all the pressure he's under right now(with The Avengers).