I believe the plan is to have him in the MCU but have Wade be the only one who remembers the FOX film continuity. Which could be quite funny. Especially if (as rumored) they bring Brolin, Zazie and Morena Baccarin back as Cable, Domino and Vanessa… but they’re the MCU versions who don’t know Deadpool or what he’s talking about. I could see that being played for laughs, especially if they make Brolin larger through costuming and/or CGI…
“Hey, weren’t you shorter in the other universe?”
“What the f@#$ are you talking about, clown?”
Stuff like that.