I Think The Only Mutant Not In X-Men Days of Future Past Is Dazzler: Casting News
You may recall Cudmore from his appearances in X:2 and X:3 as Peter Rasputin/Colossus. Who will Bingbing and Stewart be playing? If you look closely at the photo on Twitter, you can see that the character names of Bingbing, Stewart, Peter Dinklage, and Omar Sy have been obscured. However, it is believed that Bingbing will be playing teleporting mutant Blink.
While you ponder the possibilities for the remaining actors, have a look at Hugh Jackman's newest stills from The Wolverine.