There was the plan, currently on hold if not dead, to give one of the upcoming spinoff films entirely to him, and there was a follow-up rumor after Felicity Jones was cast in Rogue One: A Star Wars Story that she was actually playing his daughter.
A lot of the talk about the Star Wars standalone movies seemed to revolve around finding a place to give more screentime to Boba Fett.
While there were a handful of original trilogy cameos, he was not one of them.
While that rumor was clearly dead before the film came out, there was still a possibility that the bounty hunter could have appeared in the movie.