According to TheWrap, Chloe Grace Moretz, Elle Fanning and Hailee Steinfeld are on the shortlist to play Jean Grey, while Ben Hardy, Charlie Rowe and Timothee Chalamet are in the running for Cyclops/Scott Summers.
Here's more about the actors from CBR
Although no official test offers have been made, the website's sources contend Singer has met in recent weeks with both Moretz ("Kick-Ass," "Carrie") and Fanning ("Maleficent," "Young Ones"), who would assume the role originated by Famke Janssen in 2000's "X-Men." That news comes with two caveats: That those three actresses aren't the only ones on the list, and it's unknown whether Fanning is even interested.
While Steinfeld, who earned an Oscar nomination for her role in 2010's "True Grit," is also an established name -- even at the age of 17 -- the same can't be said of those three actors reportedly in contention to play Cyclops: Hardy is best known as the latest actor to portray Peter Beale on the long-running U.K. soap opera "EastEnders"; Chalamet had recurring roles on "Royal Pains" and "Homeland," and appears in "Interstellar"; and Rowe currently stars on the Fox series "Red Band Society.Now the real question... Who will play Storm?