Re: Matthew Vaughn Helming X-Men: First Class Sequel
I can see a situation where Jennifer Lawrence would try to get out of her contract since her career is on the upswing and the role of Mystique is fairly taxing and... kind of naked. If XM:FC, she didn't have to show much since she wasn't "mutant and proud" yet, but the next would be different.
However, I also think Lawrence has so far been a pretty classy actress/person and may keep her word on continuing. Scheduling wouldn't be impossible since she could be a supporting role. I recall Rebecca Romijn only being on set for something like 25 days for X2 (and even less for Last Stand).