Nooooooooo!!!!!!!
EDIT: seriously, I've been thinking. From the start I thought that Mr. Oz took Nuperman out of that universe/ timeline/ whatever at the moment of his "death" (and apparently, he did the same to Lois). But if so, WHERE did he take him?
My guess is that he took him to his base/ lair/ evil-looking castle. Remember Morrison's map of the multiverse? That there were some places orbiting the various universes? What if they are THERE?