Hawkeye was also supposed to be in Winter Soldier but got cut so I think Clint, Natasha, and Bruce/Hulk are unfortunately going to be relegated to a sort of supporting cast structure for a while. I think Jeremy Renner's contract specifically says he can do only a few more movies and a possible Hawkeye solo film...
I mean, it would be awesome to finally get another Hulk movie and finally check up on Banner's supporting cast again as well as see more Hulk characters and villains, but after the last two movies lack of success at the box office, Marvel isn't very big on doing one right now. He'll probably have a big presence in Civil War, if only because it'll be a big deal which side Hulk ultimately sides on
.