Marvel's head of television Jeph Loeb gave a statement to BuzzFeed (via CBM) while promoting a new season of Ultimate Spider-Man that might give the impression the studio is considering a Heroes For Hire movie. He lumps Heroes For Hire together with Guardians of The Galaxy as a possible franchise. However, he could be just talking about a potential TV project similar to S.H.I.E.L.D. or even it's own cartoon series. The pair of heroes are currently supporting characters in the Spider-Man series and are likely there to boost awareness to the public. There had been development on both Power Man and Iron Fist films for years. Given that history at Marvel it's not hard to believe combing the two into one film could be a future project.
"Just like we just announced Guardians of the Galaxy, we are certainly looking at the Heroes for Hire franchise which is Luke Cage and Iron Fist."