Magneto and Charles' relationship at the end of Days of Future Past:
"At the end of the movie [Magneto] flies away without his helmet, with the implication that he'll go off and continue to be Magneto in some form, but not be able to hide it from Charles, who'll be able to read his mind and track him. There's a truce of some kind between Charles and Magneto, but there's a part of Magneto that will always be the Magneto we know from the comics."

How Wolverine will still get his adamantium claws, possibly offscreen:
"We don't see it because he doesn't pop his claws at the end of the movie [but like with elements of the story] perhaps how he got his claws is different. But he lands ultimately in the same destination."

How Mystique could still be Nightcrawler's mother in this continuity:
"Since Azazel was killed, does this mean that Mystique gave birth to Nightcrawler in the time between 'First Class' and 'DOFP'? All I will say is that ten years transpired between 'First Class' and 'DOFP', so anything is possible. She's a young woman in her 20s going on 30s... and I will leave it at that.

Magneto is indeed Quicksilver's father:
"It's a fascinating relationship. Erik grew up without a family, it's such a huge part of him, of his mission. So the idea of exploring what it means for Magneto to be a father and reconnect with a son many years after his birth, is fascinating and certainly something that would be interesting to explore in future films."

'Apocalypse' will be the biggest X-Men film so far:
"The 'Apocalypse' story is a bigger film in scope or scale and a more powerful villain than we have ever seen in these films before."

The "future" characters from X-Men: Days of Future Past won't return in X-Men: Apocalypse:
"'Apocalypse' really follows the stories of the 'First Class' mutants, so in future X-Men films, perhaps, but in 'Apocalypse', it'll really be the younger generations."

Whether an X-Men 4 will ever actually happen:
"I'm entirely focused on 'Apocalypse' and hopefully the best film in the franchise [but] it would be lovely to work with the original actors again. Perhaps, but right now it's all 'Apocalypse'."

Psylocke nearly made an appearance in X-Men: Days of Future Past and may be in X-Men: Apocalypse:
"She's a fan favourite, and also a favourite of mine. We have a small part that she plays in 'Last Stand', and we talked about including her in 'DOFP' quite seriously actually. There was a version of the script she was in and we even auditioned some actors in Montreal. But we didn't feel there was enough of a part she would play in a movie that was already full of many, many mutants. She has a cool power. I know Bryan thinks she's a neat character so there's certainly a chance she'll be in an 'X-Men' movie some day. Hopefully there'll be a lot of 'X-Men' movies and there's lot of mutants we're yet to fully explore onscreen, even if they've had cameos before. Now we're making more films there's a chance to dig deeper."

So might Scarlet Witch:
"When we made 'DOFP' there is a reference to her in the scene when they're at Quicksilver's house, but we ended up pulling it out because like a lot of things it had to be sacrificed for the main momentum of the film. It's a character we all love, because everyone loves Quicksilver so much. The more we can do to explore his family, the better. So maybe."

Oh, and thankfully, Cable too:
"We also talked about including him in 'DOFP'. I will say, we love the character, we'd love to find a place for him in these movies, but I cannot confirm or deny which characters will actually be in 'Apocalypse' until I read some spoilers!"

Apocalypse will finish the 'First Class' trilogy:
The thrust of 'Apocalypse' is really to complete the trilogy we began with 'First Class' - to complete the stories of young Raven, young Hank, younger Charles and Erik. And complete this trilogy of four people who began the films sort of disparate and in different worlds... [and who] we've followed through the span of decades. So that'll be the thrust. There will be familiar characters and new characters that we haven't seen... ever... but it'll be the completion of what we began in 'First Class'."