Unfortunately, director Scott Derrickson won’t be directing Doctor Strange: In the Multiverse of Madness. He said on Twitter:
Marvel, on the other hand, released this statement via Variety, which first reported the news on their website:
Marvel Studios and Scott Derrickson have amicably parted ways on ‘Doctor Strange in the Multiverse of Madness’ due to creative differences. We remain grateful to Scott for his contributions to the MCU.
Still according to their website, the movie will begin production in May and the filming schedule should be affected by this, as they’re already searching for a replacement.