Marvel completed their reboot a couple months back with the Secret Wars cross-over. Basically, Molecule Man was a time-bomb created to erase all off history across the multi-verse. Doom finds out, defeats the beings who created him, and does what he can to salvage the few bits of reality still existing. So he creates Battleworld, where he rules as God Emperor Doom. Everyone believes Battleworld is how the universe always was (false memories) save for the few people who helped create it, and a few people who survived the destruction on high-tech life boats (Reed Richards, Thanos, Black Panther, Miles and Parker, among them). In the end, Battleworld falls apart in a battle between Reed and Doom (which I haven't read yet since the core book is running a few months late), and the new, single Marvel Universe is created. In it, they've cherry-picked their favorite characters from the Ultimates Universe, '90s New Universe, classic Marvel Universe, and random parallel timelines (Spider-Gwen, Maestro Hulk).