Check out a photo Bryan Singer posted on Instagram of Patrick Stewart and Jason Reitman visiting the set of X-Men: Apocalypse.
Before you get your hopes up for Stewart reprising as Professor Xavier, apparently Stewart, Reitman and Michael Fassbender were a part of a live reading of The Big Lebowski later on that night.
The second set image below is of a destroyed Cairo, Egypt, the home of Storm.
Stewart is currently rumored to be reprising one last time as Prof. X with Hugh Jackman in the sequel to The Wolverine.
X-Men: Apocalypse has a May 27, 2016 release directed by Bryan Singer starring Jennifer Lawrence, Michael Fassbender, James McAvoy, Nicholas Hoult, Evan Peters, Ian McKellen, Rose Byrne, Sophie Turner, Tye Sheridan, Alexandra Shipp and Oscar Isaac.