In a recent interview with Collider, writer/producer Simon Kinberg revealed a few details about the opening scene of the movie. Teasing the dystopian future the X-Men inhabit and showing what looks to be a final stand, Kinberg had this to say:
“Well, that opening scene is introducing, really, this sort of refugee group of mutants that Kitty’s the leader of in the future. And so, in the movie, it’s before we even meet our X-Men, it’s before we meet Patrick, Ian, Hugh, and Halle. We sort of cold open in many ways on Kitty, Warpath, Blink, Colossus, Sunspot, Bishop, and we sort of wanted to show what a pack of these refugees living day to day knowing the Sentinels are out there, what their life would be like, and what an attack would look like, and also setting up Kitty’s power, of being able to send consciousness back in time to warn people so that they can move away before the attack comes." he said. "That’s the sort of critical engine of the movie, her sending a consciousness back to 1973 to warn that something bad is gonna happen that they’ve got to stop from happening.”
He also gives some information on the film's much discussed budget which it had been rumoured was only topped as Fox's highest ever by James Cameron's Avatar:
“The budget was not bigger than Titanic’s budget was, I can suspect that’s true… We do not have James Cameron money. They gave us a healthy budget to make the movie with, and it was all we needed. It’s a big movie. It’s definitely the biggest in scope and scale of any of the X-Men movies. You know, X3 had a really big budget, too.”
Having previously worked on X-Men: The Last Stand, Kinberg also compared the two movies saying that DOFP was "a much better movie." - Well here's hoping right?
X-Men: Days of Future Past's huge all-star cast includes Hugh Jackman, James McAvoy, Michael Fassbender, Patrick Stewart, Ian McKellen, Jennifer Lawrence, Daniel Cudmore, Nicholas Hoult, Peter Dinklage, Halle Berry, Adan Canto, Anna Paquin, Evan Peters and Ellen Page, and is set to be released on May 23rd, 2014.