Apparently Morena Baccarin will be in DEADPOOL 3 but it will depend on negotiations with Disney and Marvel! Both the first film of the chatty mercenary and the second were absolute successes. So much so that they made us forget the character's first appearance in the Wolverine movie, which achieved the feat of not pleasing anyone!
With the return of the character to the hands of Marvel, there is much speculation about the adult tone of the film. After all, many do not believe that Disney will explore this side of Bullseye. Anyway, much was promised for the new production and recently Morena Baccarin spoke about being or not in the film.
Apparently, the actress who made a romantic pair with the anti-hero is interested in participating in the recordings that have a start date. But it all depends on the negotiations that will take place. For me she's already in the movie and it's nothing more than marvel's move to be in the news, but it would still be a shame to lose the character!