What is the sequel to X MEN FIRST CLASS going to be about? ]<>X<>X<>X<>X<>X<>[?

i know that it probably won't be out for 2 - 3 years, but im curious.
Is it going to take place only a couple of years after first class,
with a young James Mcavoy reprising his role as Prof. X, with perhaps
a different, earlier cast of X - Men than we've had in the first 3
movies?

Or is it going to jump back to the future, when an old and bald(ing)
Prof. X, played by Patrick Stewart again, leads Storm, Cyclops, and
the other X men?

Or maybe it will be in between, in the mid future, and we follow Prof.
X as he finds and recruits Storm, Cyclops, and the others?

What do you think?