Rumors of X-Men 7/Dark Pheonix/1990s period film abound. Singer apparently not returning, but Simon Kinberg rumored to be writing script. The young X-Men (Cyclops, Jean, Nightcrawler) from Apocalypse possibly returning.
Legion (Xavier's insane son) series being executive produced by Singer. Patrick Stewart to possibly make an appearance.
Getting very good buzz.
Logan film (last Wolverine movie) getting extremely good buzz.
X-Force and New Mutants films both in the works.
Gambit film stuck in development hell, but still coming along.
Gathered all this info from different websites, some of it definitely not 100% sure, so should generally be taken with a grain of salt. But all sounds pretty exciting.
(Still wish Singer was returning to direct, and although it's not impossible, he's currently working on directing other projects right now.)
"It is written among the limitless constellations of the celestial heavens, and in the depths of the emerald seas....the world which we see is an outward and visible dream of an inward and invisible reality."