The Latino Review caught the action at Disney's D23 Expo a few days ago, and they got a few words from producer Steven Linsberger. What came out of the exchange would certainly be good news for Tron-atics all over the world - Tron: Legacy is in the works.
Linsberger wasn't sure if he should mention it or not, but let it loose anyway. There is indeed a new Tron game in the works, and Disney Interactive is on the job. That's all he said though - other details like platform and genre are still a big mystery, but at least Tron fans will have that assurance.
It may not be Tron, but this might be the next best thing: