yeah, I have the feeling one of those two will appear.
I think there will be at least 4 x-men from original trilogy, along with old Magneto and Xavier. So that would be 6 characters.
And Bryan will probably add one or two new characters on the future, so the final number could be between 7-9.
Thats my bet. Im soo sure the future wont have less than 7 characters.
Time will tell, as always.