With the two previous attempts at making a Hulk film not going so well, it was a bit surprising how enthusiastic fans have reacted to Mark Ruffalo's version of Bruce Banner and his monstrous alter ego. There has been a clamoring for a new Hulk solo movie… yet there are none on the horizon. Why?
Ruffalo revealed one possible reason in an interview with Collider. Seems that the original distribution deal to release the Ed Norton film is still in place and Marvel Studios would have to make a deal with Universal as the company still hold the distribution rights.
The actor also said he's still under contract for four more movies. He speculated that could mean Avengers: Infinity War Part 1 and Part 2 and then either appearing in some other characters movie or doing a solo film. He has not been asked to be in Captain America: Civil War yet.