While Tron has never been one of Disney's insanely popular properties, the love for it from fans is far from small. The franchise seemed dead following the cancellation of Tron: Legacy's sequel, but then it was announced another Tron movie may still happen. While a direct sequel to Legacy has still remained in development hell, some sort of reboot or spinoff with Jared Leto has been rumored as a possibility. Leto recently confirmed that, while he is in talks for a possible Tron movie, it's still very early in the conversation. According to Leto...
I do think there's so much potential in that world, there's so much left to be said. I'm absolutely game to try to help in any way that I can bring that to life. It's something that we're in discussions about and very much looking forward to bringing to reality. It's very early days though.
The initial reboot about Jared Leto's Tron involvement focused around a character named Ares who was apparently part of the proposed script for Tron 3 and the idea was to take this character, and possibly some other elements from the abandoned Tron project, and use them to build a new movie. Leto has confirmed with Collider that a Tron project is at least a possibility, even a probability if everybody is as interested in making it happen as the actor makes it sound, but if talks are really in such an early stage, details of the actual movie could certainly change drastically between now and whenever things actually end up on the screen.
While Tron: Legacy didn't set the box office on fire, it did manage solid performance, and a third film was expected before being officially canned a couple years ago. While some have still held out hope that Tron 3, or Tron: Ascension as it apparently would be known, might still happen, it seems clear that whatever this project would be, it would not be that. Tron: Legacy writer/director Joseph Kosinski has described the third film as being in a "cryogenic freeze," saying that while the idea isn't dead, it's not currently an active concern.
Meanwhile, Jared Leto is apparently actively talking with people about a Tron movie. While the project has been described as a reboot, if the idea for the film came from the Tron: Ascension script, and that movie still might happen, then this idea might qualify as more spinoff than reboot. Leto calls the original Tron one of his favorite movies, so it's possible that he'll really be pushing to make this happen. Other Tron fans will likely be happy to see some sort of Tron movie happen, even if it doesn't turn out to wrap up the events of the previous film.