If he's playing a mutant, I think its pretty obvious that he's playing Bishop especially with the movie dealing with time travel and Sentinels. This is the perfect time to introduce Bishop.
More pictures of Omar Sy:
Looks like Bishop to me!
"This is our chance to make a difference" - Sue Storm - The Invisible Woman
"He's stronger than any of us but he's not stronger than all of us" - Reed Richards - Mr. Fantastic
"We could these powers to help people" - Johnny Storm - The Human Torch
"You can't fix this, nobody can" - Ben Grimm - The Thing