Word on the street is that the increadibly awesome Peter Dinklage (of "Game of Thrones" fame) has been given a role in X-Men: Days of Future Past. But there is no word as to who he will be playing. The two rumors I hear are AWESOME, but almost certainly wrong.
Rumor #1 - Puck
You don't know how badly I want this to be true. Alas, Puck (member of Alpha Flight - a team linked to Wolverine's past) doesn't play a role in the comic book version of Days of Future Past. This is not to say they couldn't branch off in the movie. But why would they introduce Puck over, say, Cable or Bishop - two time-travelling X-men.
Rumor #2 - Doctor Strange
Dr. Strange is going to be part of Marvel's second Avenger's phase. Which is run by Disney, not Fox. Fox has the X-men, Daredevil, and the Fantastic Four. Disney has the rest. So the chances of Dinklage playing Stephan Strange are pretty slim (though he would be AWESOME!).
If I had to guess, I'd say Dinklage will play a role like that of Bolivar Trask - creator of the Sentinels. But who knows - maybe artist Brandon Bird's guess is correct:
Taking a three-day weekend, folks. See you Tuesday!