Even if the movie has more action (really expected), Charles will be the main voice of the X-men, with his philosophy and his new "proffesor" side, that they will have to adress, after first class end.
He will be the mentor of the x-men and maybe the first students on the school, so that along with his new scenes with Erik will be pretty decent for his role on the sequel.
oh, and I want to see his struggles too, lets hope Matthew adress it on one scene, at least. we'll see what happens in 2 years
Next Big X-Men Crossover
* 2017- X-Men: Age of Apocalypse
Edit: Forget about 2017:
Official announcement -> X-MEN: APOCALYPSE - MAY 27, 2016!!!!