But initially, there was zero indication this movie was going to be connected to previous films at all beyond taking place in the same universe, and fans who are waiting for Tron 3 will likely take what they can get.
It’s unclear if the idea is that this new movie would actually be Tron: Ascension, the name the third Tron movie was supposed to have, or some new Tron 3 idea.
And the movie could still be something of a reboot/spinoff rather than being a direct sequel, where the Tron: Legacy characters are just there to give continuity to something that will ultimately be a separate story.