It sounds like we really haven’t seen the last of the Hulk in the MCU. He was one of the original six Avengers to survive the events of Avengers: Endgame, and Feige has said that the pieces left standing after that movie were done intentionally.
In a new interview with People, Mark Ruffalo says he’s set to meet with Kevin Feige about appearing in She Hulk:
“I don’t know, I’m supposed to go meet with great Mr. Feige. Great mysterious Mr. Feige to see if there’s some place.”
For those unfamiliar with She Hulk’s origin in the comics, Jennifer Walters got her powers when she needed a blood transfusion and no one else was available except for her cousin, Bruce Banner. So it makes perfect sense for Ruffalo to have a cameo in the show.