January Jones played Emma Frost in the X-Men: First Class movie, and she says she won't be returning.
"I haven’t been asked back. It’s called Days of Future Past or something, Jones told the Collider. "No, they’re going into another time period, or they’re going back and forth from different time period and Emma’s not in that. Not in what they’re doing."
Bryan Singer seems to be going back to the original approach of his first two X-Men movies and away from what was a very popular approach amongst fans with First Class.
One more character that will not be coming back is Nightcrawler, as Alan Cumming recently shot it down.
January Jones will be featured in the upcoming season of Mad Men on AMC.
X-Men: Days of Future Past has a July 14, 2014 release date starring Jennifer Lawrence, James McAvoy, Michael Fassbender, Nicholas Hoult, Anna Paquin, Ellen Page, ShawnAshmore, with Hugh Jackman reprising as Wolverine, and returning cast members Patrick Stewart and Ian McKellan.