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.
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.