Well, given that FOX is clearly interested in expanding the X and FF franchises like Marvel is doing with the Avengers, this wouldn't surprise me one bit. And given that X-Force is on the table, and how much Remender's run focused on Apocalypse, I wonder if that might not tie in. Having Cable come back in time from the Age of Apocalypse would be an easy way to streamline that sordid tangle of character history, while also providing a motivation to the team and creating a multi-film arc to tie various sub-franchises together.
It's unknown. I'd imagine the First Class cast or an all new team of mutants (a la X-Force).
Ah was not sure if it could be another crossover. Like days of future past changes the future so the result is age of Apocalypse leading to both future + past working together to try and fully fix the timeline ........ OH! You need to do a branching Xmen movies timeline with all the alternate timelines!
Nice. Between this and Days of Future Past I'm actually excited in the X-Men movies again...something that hasn't happened since X2. And I bet Jackman is back as Wolverine for this. I don't see how Fox wouldn't ensure that, and he still seems to like the character. I haven't seen him express any interest in laying down his claws.