X-Men: Days of Future Past is one of the greatest story arcs from one of the greatest eras of the comic, the Claremont/Byrne days, and it's being adapted into the next film in the movie franchise. Bryan Singer has returned to the director's chair, and the original cast is returning to join the cast from X-Men: First Class. Beyond that, all we have to go on is the very first teaser trailer, above. The beginning and end give me chills. The middle... dunno. Movies typically serve too many masters and agendas to nail story these days. I have hope. My claws are crossed. But I'll enjoy it when I see it. In the meantime, if you've never seen the X-Men movies, or you just want to see them again, iTunes has you covered:
I liked the first two and First Class, Last Stand and Origins weren't good (you gotta fail really hard to ruin a Joss Whedon storyline). If you want to read the comic on which the movie is based, you can grab it from iBooks. Along with the Phoenix Saga and Astonishing, it's one of my favorites.