Now, according to Comic Book, three more X-Force characters (Sunspot, Feral, and Shatterstar) are being cast for a post-credits scene that will precede a future
X-Force standalone movie.
As for Peter, he was an undeniable standout in the late stages of the marketing and if any of the parodic
X-Force actually belong in a proper
movie version of the team, it's paradoxically him (the writers have even said they want a Peter
standalone).