Salocin, there is a section in one of the books to the Last Battle where Melkor slipped back into the world thru the Door of Night while the guard was asleep. It says that Tuor will come back and and pretty much take him down, and the Valar will in turn make him one of the Eldar, i think, or at least admit him to Aman. There is also a part saying that Feanor will come back and deliver the Silmarils to Yarvanna who will break them and release their light etc etc, I dont have a reference for this at the moment, but I believe it's in UT or the Lost Road (HoME).
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