Now we get an update, and that is that Peter Dinklage might be the film's main villain.
Variety reported on Singer's announcement as well, but in their article included mention that a source filled them in that Dinklage would be the film's main antagonist.
Well, the net has been throwing out all kinds of guesses as to the identity ranging from a Peter Dinklage CGI Mr. Sinister - which might be pretty cool - to even M.O.D.O.K. (just, no!).
However, how about voicing Nimrod, the Master Sentinel?
The Sentinels (as seen briefly of sorts in X-Men: Last Stand) are gigantic robots created by the government to hunt down mutants, with Nimrod being the advance version from the future that comes back through time to hunt down mutants the govt. deems as a threat.
Singer even mentioned that he is experimenting with an all CGI character; could it be for Peter Dinklage?
X-Men: Days of Future Past has a July 18th, 2014 release starring Hugh Jackman, Jennifer Lawrence, Michael Fassbender, James McAvoy, Nicholas Hoult, Ellen Page, Shawn Ashmore, with returning from X-Men, Patrick Stewart and Ian McKellan.