As of now, the only official details we know about Deadpool 3‘s plotline are that it will finally see Ryan Reynolds’ Wade Wilson share the screen with Wolverine. Hugh Jackman is making his surprise return as Logan in the Merc with the Mouth’s MCU debut, but it’s possible that Jackman’s involvement alone gives away the fact that the threequel will actually serve as an unexpected follow-up to one of Fox’s finest X-Men movies.
One redditor has put forward the compelling theory that Deadpool 3 might just be a surprise sequel to X-Men: Days of Future Past. The biggest piece of evidence comes from the fact that Jackman and Reynolds have assured us DP3 won’t contradict Logan. It will take place many years before that Logan‘s events, thereby confirming this one will be set in the present-day. e.g. 2024. That just happens to be one year after the Sentinel-controlled timeline depicted in Days of Future Past.