What we know about Avengers: Doomsday is limited, but fans are hyped to see mutants back on the big screen. A rumor from Cosmic Circus claims that the X-Men will be wearing brightly colored costumes, which are more accurate to the comics and cartoons. Scooper Alex Perez writes:

We have a rumoured list of actors who will return in Avengers: Doomsday next December, along with details on the costumes that the X-Men will don when they cross paths with Earth's Mightiest

Marvel Studios’ Avengers: Doomsday has received a brand new update, teasing the official introduction of the X-Men into the Marvel Cinematic Universe. The next Avengers movie is scheduled to make its debut on December 18, 2026, which will be followed by Avengers: Secret Wars’ premiere on December 17, 2027.