"It is the first class of Xavier's school, way back when, so it's young Scott, young Jean, young Beast and that'll be really fun," Donner said. "I think (the plan) is to follow some of the characters into their own stories, and weave them back into the X-Men world.
"And hopefully First Class will become its own franchise and we can follow them as they grow up."
Donner also confirmed that X-Men Origins: Magneto is still in development.
No production date has been set.