Originally Posted by Mr.M
I think the way this is shaping up, the future era will focus on getting Xavier's mind, or the twin brother's mind, sent back to the past, or mind-swapped with the younger version of Xavier. It will revolve around what I believe will be Omar Sly/Bishop's character providing the device or the platform to acheive this, because I don't think a mind swap into the far past should be easily acheivable by any means. I think it will be about the original X-Men getting to this device before the Sentinels and the villains responsible for the genocide get to it.
The past era will probably have a young Xavier receiving this information somewhere in the final act, so that the future era does not appear to be anti-climactic (X-Men having succeeded in sending Xavier's mind back in time). Then the FC X-Men will try to stop the events from unfolding. Just my wild guess.
Act I: 1973
Act II: 2013
Act III: 1973
With Acts I/II altering back and forth between one another.
that would be an interesting way of doing it