Just as he said he would, Bryan Singer continues to promote the upcoming sequel to X-Men: First Class via his Twitter account. The director's latest tease is the following snap from a production meeting which reveals some set designs. As you can see the main one is clearly some type of building, and I'm going to assume that's not the X-Mansion given that it resembles a much more fortified structure - something from the future setting perhaps?
Keep an eye on Singer's Twitter account (link below) as more is sure to come.
X-Men: Days Of Future Past has a release date of July 18, 2014 and so far the confirmed cast members are: Ian McKellen, Patrick Stewart, James McAvoy, Michael Fassbender, Jennifer Lawrence, Nicholas Hoult, Anna Paquin, Ellen Page, Shawn Ashmore and Hugh Jackman.