The official plot synopsis of Tron 3, the movie sequel to Tron legacy, hasn't been revealed yet, but the teaser hinted at the Dillingers as the next villains. Well, Director Joseph Kosinski kind of confirmed:
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."
Sounds good to me, let's that Tron 3 will enter production soon!