(Warning: This post contains potential spoilers for Marvel’s Avengers: Doomsday.)
Marvel President Kevin Feige has confirmed that the Avengers: Doomsday script is still being revised during production. He also revealed that Michael Waldron, the creator and head writer of the Loki series, is now helping write the Doomsday script alongside Stephen McFeely.
Speaking to The Hollywood Reporter, Feige confirmed that the Avengers: Doomsday script is undergoing changes. He described “plus-ing” happening every day on set, saying, “It is amazing to watch because those filmmakers, those actors—both the ones who are playing these characters for the first or second time and the ones playing them for the 10th or 12th time—are the best in the world at it and know these characters so well.”
He added, “So if they have an idea, you want to listen to it, you want to adjust to it, and you want to improve it. I wouldn’t want to change that.”

When speaking to Variety, Feige said, “We’ve never started [filming] a movie without a full script.” He added, “I have never been satisfied with a script that we’ve had. I’ve never been satisfied with a movie we’ve released.”
Also, Feige plans to continue overseeing Marvel Studios for the next 10–15 years.
“That’s all I want to do. Marvel is a great way to do that for me right now, but I hope to make big movies for lots of people forever.”
According to Feige, after Avengers: Secret Wars there are plans to “reset singular timelines” and reboot the MCU.

He said, “Reboot is a scary word. Reboot can mean a lot of things to a lot of people. Reset, singular timeline — we’re thinking along those lines. X‑Men is where that will happen next.”
Directed by Russo brothers from a screenplay by their longtime collaborator, McFeely. Newton Thomas Sigel (Bohemian Rhapsody, X-Men: Days of Future Past) will be the cinematographer.
In Avengers: Doomsday, the MCU begins the beginning of the end. As the multiverse nears total collapse, the Avengers assemble to face their greatest challenge yet—incursions, catastrophic collisions between realities that could destroy the entire multiverse. Earth’s Mightiest Heroes must race against time to save their reality while confronting the powerful figure behind it all—Victor Von Doom (Robert Downey Jr.).
The official cast members of the film include Downey Jr. as Doctor Doom, Paul Rudd as Ant-Man, Simu Liu as Shang-Chi, Tom Hiddleston as Loki, Florence Pugh as Yelena Belova, Danny Ramirez as Falcon, Sebastian Stan as Bucky Barnes, Winston Duke as M’Baku, Chris Hemsworth as Thor, Letitia Wright as Black Panther, Tenoch Huerta Mejía as Namor, Anthony Mackie as Captain America, David Harbour as Red Guardian, Wyatt Russell as U.S. Agent, and Hannah John-Kamen as Ghost. Ian McKellen as Magneto, Patrick Stewart as Professor X, Rebecca Romijn as Mystique, James Marsden as Cyclops, Kelsey Grammer as Beast, Cumming as Nightcrawler, and Channing Tatum as Gambit. Pedro Pascal as Reed Richards (Mr. Fantastic), Vanessa Kirby as Sue Storm (Invisible Woman), Joseph Quinn as Johnny Storm (Human Torch), Ebon Moss-Bachrach as Ben Grimm (The Thing), and Lewis Pullman as Sentry.
Source: The Hollywood Reporter and Variety
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