The future for the Fox Marvel characters is a bit unknown right now with the merger in the works. There is a very good chance that Marvel will integrate the X-Men, Deadpool, and the Fantastic Four into the Marvel Cinematic Universe at some point. However, no one really has a timeline for that and that leaves a lot of projects in limbo.
Two of those projects are the next Deadpool movies; X-Force and Deadpool 3. It's too early to really know much about either project, but Screen Rant spoke to writers Rhett Reese and Paul Wernick recently and they clarified a few things. Reese, for example, cleared up the timeline so we know when each movie takes place.
According to the chronology that we've established, X-Force will be next, before Deadpool 3. It's a bit of the "Iron Man 1, Iron Man 2, The Avengers, Iron Man 3" model, in that sense. X-Force isn't being written by us. It's being written and directed by Drew Goddard, or at least that's the plan right now. We're not involved with that one. We do anticipate there will be a Deadpool 3 at some point, but it's just a little premature, because it will definitely take a backseat to X-Force for the time being.
Wrenick went on to say that X-Force is the next up as far as their Marvel projects go and that they are in communication with Ryan Reynolds constantly.
We're constantly in touch with Ryan (Reynolds), and we're always throwing ideas back and forth via text and phone conversations. So, it's always at the front of our minds. We'll get there when the time is right, but as of right now, X-Force is next up.
It's still way too early to definitively say whether or not these movies will actually happen. If there is one thing we all seem to agree on, it's that Deadpool movies work. Disney would be stupid to throw all of that money away.