Remember the rumors about Planet Hulk, a Marvel Comics storyline where Hulk is sent into space because they can't control him? And this leads to World War Hulk, where him and his alien team come back and try to destroy the Avengers. Fantastic arc
Ruffalo has previously said that Planet Hulk would not be the best thing for his character, but there has been talk among fans, and Ruffalo implied that there might be some talks at Marvel
In a recent interview on a press tour for Age of Ultron, Ruffalo said this in an interview with IGN:
Mark Ruffalo: "I think there is a lot of places to go with him.
Scarlett Johansson : "Like Where"
Ruffalo: "Well he's going to space. Yeah, I mean there's been some talk of maybe Planet Hulk
There have been some talks that Marvel has been considering a new Hulk film, and it is impossible not to bring up what could possibly be Hulk's greatest story arc yet.
Part of the reason they haven't already begun production is the cost.
In Planet Hulk, Bruce Banner is completely out of the picture, and it is just Hulk in his hulked-out mode. Fans want to see the Hulk, but it has to be Banner at least 75% of the time due to the enormous cost of the CGI used to create The Hulk.
Fans have responded well to Banner and the Hulk trying to reach a balance, kind of like a Dr. Jekyll/Mr. Hyde type thing.
The Avengers have been confirmed to be going to space via Infinity War, but it is unclear which Avengers it will be, though recent rumors have said that none of the original members will be participating.
There have also been some rumors of The Hulk joining The Guardians for Guardians of the Galaxy 2. This could also be aftermath of Civil War, but it is unknown if Hulk or Banner will even be in the film.
The grounds of his exile are unknown, as well as if they are actually considering it at all.
Stay tuned for more details
Extra Tidbit: THANK GOD!