Looks like we've got some official movement on X-Force:
Drew Goddard has been tapped to direct, and the film with features Deadpool and Cable (surprising no one).
So let the speculation begin on the cast and story.
With Cable's presence, time-travel is a strong possibility. Maybe they could do a spin on the Messiah Trilogy? Something like, Cable assembles X-Force from mutants throughout time to protect the first natural mutant birth after Transigen's destruction.