Story and plot details are scarce right now, but Marvel Studios has begun early development on Ultimatum. While the villain group ULTIMATUM has been rumored to play a role in the upcoming The Falcon and The Winter Soldier series on Disney+, this Ultimatum sounds much bigger than them. Specifically, it appears to be a modified version of the Marvel Ultimate storyline of Ultimatum, although with tweaks needed to adapt it to the existing Marvel Cinematic Universe.
For those unfamiliar with the Ultimate comics storyline of Ultimatum, it was an epic event that involved the Fantastic Four and X-Men, including Doctor Doom manipulating events from the background to kick the whole thing off. Namor even played a part. The story dealt with the deaths of Scarlet Witch and Quicksilver, Magneto going full evil maniac over the deaths of his children, and the Fantastic Four, X-Men, and other Marvel heroes uniting to defeat him.
Obviously, as said above, the story would need tweaks to be adapted to the MCU, but most of the comic storylines they’ve adapted have been tweaked without many problems. Hulk took the Silver Surfer herald role to announced “Thanos is coming” in Avengers: Infinity War, for example. And of course Captain America: Civil War was a huge improvement over the original, so I think people should have faith that Feige will tweak this enough to not be the nightmare the comic event was.
