I'm on board with Jaime killing Cersei. I've felt that would happen since I finished "A Dance with Dragons" and seen how their relationship has deteriorated in the books.

Jon will find out his parentage, but I'm not sure how yet.

Jorah can't be the Prince that was Promised. The prophecy says that it is a Targaryen by birth. I think it's Jon, but may be some union of Jon and Daenerys.