Peter Dinklage Said To Be Bolivar Trask In X-Men: Days Of Future Past
No, it's not Mr. Sinister or M.O.D.O.K., it's actually the creator of the Sentinels, Bolivar Trask, according to MTV Geek.
The Sentinels are the giant robots the government creates to hunt down mutants and were teased in the Danger Room scene during X-Men: The Last Stand.
Trask actually has a son that's a mutant as well, but feels they are a danger to humanity.
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.