Every time I read one of these Unknown HP facts, my heart cries because there will be no more books or movies (Update: There will be a book coming out. Harry Potter and the Cursed Child, but it is the format of a play.
I disagree with Because of the horcruxes, Voldemort was never dead. He only used the potion to give himself a proper body again. Like Dumbledore says, no spell or potion can bring back the dead.<< But these are all facts