If you've gone out to see The Amazing Spider-Man 2 in theaters - and, judging by its U.S. opening weekend box office, a fair number of people have - then you should've also gotten to watch a minute-long clip from X-Men: Days of Future Past, assuming that you stayed for the film's credits. If you left too early and/or caught the latest Spidey flick at one of the advanced screenings (which didn't include the X-Men teaser), then fear not! The aforementioned Days of Future Past scene is available to watch online.
For those just tuning in: no, this crossing of paths by Marvel film properties isn't setting up for Peter Parker to share the screen with the likes of Wolverine; to paraphrase Spider-Man franchise producer Avi Arad, that's highly unlikely to happen in the near future. It's actually part of a deal struck between 20th Century Fox and Sony, where the latter agreed to do free marketing for Fox's new X-Men movie, so that Marc Webb would be freed up to direct the second Amazing Spider-Man installment.
The clip - showing Mystique (Jennifer Lawrence), along with a handful of her fellow mutants, infiltrating a military installation - does a pretty decent job of selling Days of Future Past's mutant power effects - which, by the looks of them, are an improvement over those from past X-Men installments. That's despite the sequence being very noticeably chopped up, shortened, and having part of the Man of Steel score slapped on, in lieu of the finished accompanying musical score by director Bryan Singer's trusted collaborator, John Ottman (Superman Returns, Jack the Giant Slayer).
Furthermore, this Days of Future Past sequence is proof that, for reasons that will soon be revealed, Mystique and young Magneto (Michael Fassbender) have a parting of ways at some point in this film. It's not altogether clear yet how the "Mystique going rogue" (no pun) storyline plays into the larger narrative in Simon Kinberg's screenplay, though it's possible her actions somehow contribute to the mutant-centric events that set in motion the plot - a hybrid of the superhero genre with the time-travel and apocalypse sub-genres, based on Chris Claremont's comic book of the same name.
Mystique had a significant role in X-Men: First Class, but now that Lawrence is a much bigger name - thanks to the Hunger Games films and her award-winning David O. Russell collaborations - the character arguably ranks second to Hugh Jackman's Wolverine, as far as marketability goes. No wonder a Mystique spinoff is now being considered, since something of that magnitude may be the only way to keep Lawrence in the role once her old contract for the First Class trilogy is done.
X-Men: Days of Future Past opens in U.S. theaters on May 23rd, 2014.