I am honestly not shocked of Return of Jafar being adapted. The film's been a real sleeper hit in the box office, and it's strangely one of those that Disney's done that makes a lot of sense to jump to a franchise, because there's material to use as it stands.
Along with that, there's also the potential to use more of the Arabian Nights story than just Aladdin, and I hope that's somewhat of a case with Jafar; even if it's something that I think doesn't need a sequel.