The X-Men New Mutants movie is currently in development, and while I don't believe Game of Thrones' Maisie Williams has been officially confirmed for the movie, New Mutants director Josh Boone went out and posted Wolfsbane art.
I also don't believe this is official art for the movie, but the artist did do the previous New Mutans art featuring Demon Bear.
Details on the New Mutants movie are slim, but it's been said to be different than the previous X-Men and will be more like a “Stephen King meets John Hughes”-style horror movie.
It's further said the New Mutants movie might be released Spring of 2018 and that Nat Wolff (who starred in Boone’s The Fault in Our Stars) is being eyed for the mutant Cannonball.
Other casting rumors surrounding New Mutants include Anya Taylor-Joy (The Witch) as Magik.
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Wolfsbane by Mid-World's very own @AshleyRGuillory @Maisie_Williams pic.twitter.com/XskXseRwK2
— Josh Boone (@JoshBooneMovies) February 12, 2017