User blog comment:Legionwrex/Did the Leviathan DLC really add a new twist to the endings?/@comment-1221773-20120830185451

At the moment, I don't think it's something to be concerned about. Since the Leviathan DLC has no effect on the Extended Cut ending scenes, and (according to BioWare) those endings are supposed to relate events that happen decades and centuries after the defeat of the Reapers, I think that the galaxy is safe for the immediate future. We'll have to wait for future games or books to see if the Leviathans are really intended to be the next threat.