Board Thread:News and Announcements/@comment-26863084-20160702151917/@comment-1894786-20160830211917

Honestly, I agree with Kizaru, I think it's X-Men related.

The idea that popped into my head is so insane, but I'll share it anyway.

MU stands for Mutant Universe, and all the mutants in Earth-616 are sent to an empty universe by someone to recover from the Terrigen Poisoning (my initial thought was Scarlet Witch), and that'll be the new "ultimate universe". While we continue getting stories from Earth-616 with the "Marvel-owned" people, we'll get Mutant Universe stories with the "Fox-owned" people. Basically, Marvel's ultimate f-you to FOX by separating the Mutants from canon altogether, but still keeping the fans caught in the middle happy by continuing mutant stories.