Re: New characters you want to see in the First Class sequel?
I want to see Scott too, but in the third part.
This upcoming sequel should develop the characters to date yet, and introduce a girl with a decent role.
So that would be an important portion of the screentime for all the x-men in the sequel.
Jean and Scott should be the main x-men of a sequel, so they better develop Havok, Banshee, Beast, the new girl and one more, and then focus on Jean on Scott on the next sequel and put the rest in a more secondary role.
Next Big X-Men Crossover
* 2017- X-Men: Age of Apocalypse
Edit: Forget about 2017:
Official announcement -> X-MEN: APOCALYPSE - MAY 27, 2016!!!!