Director Bryan Singer continues to tease fans with new photos from the set of X-Men: Days of Future Past. Although it still isn't known when principal photography commences, earlier today, the filmmaker showed his Twitter followers a photo of an Oxford University thesis paper written by Charles Xavier (James McAvoy) on Human Genetic Mutation in 1973. As we can see from the cover page, the CIA has shown an interest in Professor X's findings. We aren't exactly sure how this thesis paper fits into the story quite yet, but hopefully we'll learn more as X-Men: Days of Future Past nears closer to production.

<strong><em>X-Men: Days of Future Past</em></strong> Set Photo