Considering we're entering the Mutie Era, the only things I'd buy would be:
-Fantomex: Cool costume and the one X-Character I enjoy. Maybe because he's not really an X-Character in that sense.
-Maker: I've gotten tired of Doom the last few years, and started really loving Evil!Reed. The costume is ace and he's entertaining. Considering how ****ed everything was in the 1610, I can't fault him for snapping.
-Silver Surfer: Dunno how they'll pull that off, but if they do, oh boy, I'm in.
-Kang The Conqueror: God, I love Kang. But I hope they upgrade the costume a bit. Also, I'm one of the few contrarians who preferred it when it was alluded that he was a descendant of Stark. It fits much better than Reed or Doom.
-Jean Grey: Provided the actress is a beautiful redhead (I never liked teen protagonists in any sort of fiction) and the costume is good. Maybe Jessica Chastain could take a crack at it. Or Bryce Dallas Howard if she slims down. Isla Fisher could be good. Julliane Moore is too old now. Rebecca Ferguson with a dye job wouldn't be half bad. Just give me my pale, ginger mommyfu dammit!
-Mr. Sinister: He's a guy who wants to see Cyclops and Jean ****, all the while chilling in his Victorian Castle and City, populated by copies of himself, with Madelyne Pryor clones as his Harem. Oh, and he's a Victorian-Era Eugenist who looks like Techno-Dracula. How can you not love this guy just due to the visuals?
Dunno, my tastes are either sci-fi or millitary-fiction, so considering that part of the MCU is mostly done, and I loathe the Muties, I'm not seeing much that could potentially interest me. I'll never get a proper Nick Fury or Punisher, and I couldn't give a damn about the X-Men, with a few exceptions based solely on their costumes.
Honestly, I'm more likely to buy something if I like they actor/actress. If Fassbender plays something for example, it's very likely I'll buy his character. And considering he already played Magneto, if he joins the MCU he'll be someone like Reed, Doom, Kang or something similar, so I'm pretty stocked... I like Fassbender, sue me...