Bryan Singer has just announced an X-Men: Apocalypse film for 2016 release:

Update: It's trickling around twitter that Fox has sent confirmation to exhibitors of a May 27, 2016 release.

No stopping the X-Men franchise. Fox's X-MEN: APOCALYPSE will drop May 27, 2016. — Exhibitor Relations (@ERCboxoffice) December 5, 2013