Apparently, at the moment there's four different X-Men-related movies either being planned, developed, considered or whatever, all of them in different "branches" of the overall X-Men series:
- X4 -- direct sequel to the main X-Men film series, following on from X-Men: The Last Stand.
- X-Men: First Class 2 -- sequel to X-Men: First Class (obviously, that's only a working title).
- The Wolverine -- sequel to X-Men Origins: Wolverine. Apparently, though, it's a very stand-alone story in a different style to its predecessor... which doesn't make it a "reboot", I might add, any more than Batman Returns is a reboot to Batman.
- Deadpool -- I don't know much about this except that it's notably not a sequel to X-Men Origins: Wolverine but actually, completely standalone.