Bryan Singer tweeted this morning (Malaysian time) about the return of Paquin, Page and Ashmore:
Very excited to welcome #annapaquin, @ellenpage & @shawnrashmore to #XMen #DaysofFuturePast - thank you @brettratner for letting them live!
— Bryan Singer (@BryanSinger) January 26, 2013
Days of Future Past will serves as a sequel to 2011's "X-Men: First Class" and will be intended to close the gap of continuity dissonance between First Class and the main trilogy (2000 - 2006). Day of Future Past is an obvious subtitle to refer the usage of plot elements from comics like 'Days of Future Past' (1981) and 'All-New X-Men' (2012). The plot will be involving time-traveling elements, which explains the presence of X-Men characters from the future and from the past.
The end-game here is the synchronization of two different set of timelines established in the original trilogy series and another one set-up by 'First Class' itself. Speculate if you think "Days of Future Past" could potentially erases the elements from "The Last Stand"and it could spears towards new sequels for the original timeline.
X-Men: Days of Future Past will be released on 18 July 2014 and directed by Bryan Singer. Most of the original 'First Class' like James McAvoy (Prof Charles Xavier), Michael Fassbender (Erik Lehnsherr), Jennifer Lawrence (Raven/Mystique) and Nicholas Hoult (Hank McCoy / Beast) are returning.