Marvel Studios’ “X-Men” reboot aims to begin filming next year, seemingly in the early part of it, according to one of the key actresses involved. They’ll join “Stranger Things” alum Sadie Sink who was revealed as Jean Grey in “Spider-Man: Brand New Day,” officially bringing mutants into the MCU. Speaking with Vanity Fair, Sink says it’s already locked into her schedule:“We’ll shoot X-Men, and then I’m going to do a series with FX and A24 called The Marriage Plot, so that’ll be next year. With Stranger Things ending, it’ll feel weird next year not being like, Oh wait, we got to shoot another season. It was kind of nice to start out with the negative side of it with Jean, how she’s just learning what she’s capable of.