X-Men: Apocalypse Final Trailer - 10 Major Plots Hints

10. Magneto Is Driven By Loss

"Whatever it is you think you saw in me, I buried it with my family."

Ah, so that's why Magneto...wait, family? What? Who?

Yes, it appears that, in the decade or so since the events of Days of Future Past, Eric actually managed to settle down and start a family of his own. And then they were killed.

Aside from that line of dialogue, we also get a shot of what looks like Eric with his son, and it becomes clear that whatever happened to them is the driving force behind his choosing to side with Apocalypse - and it's probably not far off to say humans were responsible for it. If he'd managed to put his past behind him and start a new life, and yet now we find him wanting to destroy the world, then this seems like the logical conclusion.