Here is what Singer has to say about the film:
Singer confirmed that he will take advantage of Ian McKellen’s presence alongside Michael Fassbender to explore the moral conflict within Magneto in the film, ”It’s interesting. Because I have both Ian McKellen and Michael Fassbender in the picture, you’ll deal with both sides of that point of view. It really explores the relationship between Xavier and Magneto, and the evolution of that relationship – where it came from and where it’s going.”
The filmmaker was also asked if ‘X-Men: Days of Future Past’ strikes a darker tone, similar to the ‘Dyas of Future Past’ comic book arc, “Yeah, I have a certain style when I approach X-Men films. This ones going to be a much larger canvas, it takes place during multiple times, it has an enormous cast and there’s also other technologies and stuff… there’s some science fictions aspects to it that we haven’t seen yet in X-Men films. But I’ll probably bring a bit of my old-school tone to this one. I’m very excited about it. I can’t wait to get started.”
The official synopsis of the ‘Days of Future Past’ comic book story arc is as follows:
“The storyline alternates between present day, in which the X-Men fight Mystique’s Brotherhood of Evil Mutants, and a future timeline caused by the X-Men’s failure to prevent the Brotherhood from assassinating Senator Robert Kelly. In this future universe, Sentinels rule the United States, and mutants live in internment camps. The present-day X-Men are forewarned of the possible future by a future version of their teammate Kitty Pryde, whose mind traveled back in time and possessed her younger self to warn the X-Men. She succeeds in her mission and returns to the future, but despite her success, the future timeline still exists as an alternative timeline rather than as the actual future.”
In other news, it has been reported that on Friday night, Michael Fassbender treated his friends, Josh Brolin and Bradley Cooper to a round of drinks at Skybar at the Mondrian in Los Angeles, the boys night out was described as, “They were in good spirits having. It looked like a very relaxed night out,” the eyewitness said. Right now, I'm so stressed out from work and school that I could use a drink... but a cup chamomile will have to suffice.
Sources: Flicks & Bits