In an interview with Assignment X, Kosinski said:
“Once we get a script we’re all really happy with, we’ll take it to the powers that be and see if we can go back to the grid,”
He continued:
I think we will pick with where TRON: LEGACY left off with Quorra in the real world and what does that mean and the possibilities it opens up for the next chapter. It’s that relationship between the two of them that’s the next step.
He also agreed that the son of Dillinger, played by Cillian Murphy, would have to play a big role:
Dillinger was a really important part of the first film and felt like an easy way to continue that storyline and thread to have his son in the new movie. That way you have people ask those questions of what the Dillinger legacy is in the world of TRON. We didn’t want to ignore it completely and it leaves a really nice springboard for some intertwining development for the next film.