Well, apparently the
newsletter of D23, "The Official Disney Fan Club," is calling
New Mutants "a seriously electrifying new addition to the Marvel Cinematic Universe." The comics news sites are already reporting this as "proof" that the movie is set in the MCU continuity, but I'm still not entirely convinced, since sometimes these promotional blurbs use terms differently than fans do, or overstate or missstate things. Still, if it is true, we'll probably get confirmation from somebody before long. But it's hard to see how it reconciles with the director's statement that it's his original cut from when the film was meant to be part of the Fox X-Men universe.