We get our first look at Jennifer Lawrence in the form of a leaked image from recently screened footage of X-Men: Days Of Future Past.
Bryan Singer attended the Fantasia International Film Festival where he presented footage from the movie.
The footage featured a Wolverine with grey hair from the future with Iceman sporting a goat-tee, Kitty Pryde and a sad Rogue. Prof. X and Magneto are confincing Logan to travel back into the past to talk to Charles Xavier from the 70s. Bishop, Blink and Warpath are shown as members of the resistance.
McAvoy is shown with Cerebro, with Fassbender holding a gun. Mystique transforms into a soldier, and there are shots of Bolivar Trask (Peter Dinklage) testifying before Congress. Logan is shown confronting McAvoy, and the footage ends with both Xaviers face to face.
Sounds pretty much like the Comic-Con footage.
You can read more about the footage description from 24panelspersecond.
Here is a look at Jennifer Lawrence from the footage as Mystique with the tear representing the darker path Magneto takes compared to Xavier.
X-Men: Days of Future Past has a May 23, 2014 release date starring Jennifer Lawrence, James McAvoy, Michael Fassbender, Nicholas Hoult, Anna Paquin, Ellen Page,ShawnAshmore, Hugh Jackman reprising as Wolverine, returning cast members Patrick Stewart and Ian McKellan, with Peter Dinklage as Bolivar Trask.