Tron: Uprising has been cancelled (probably).
This isn't a surprise, in that it was on Disney XD, at midnight. A kid's channel, but kids are usually in bed by then. What was left was those geeks savvy enough to find it and geeky enough not to care what channel it showed on. It just isn't enough.
The shame of this is that the series wasn't bad at all, and was showing steady improvement over the course of the season. The imagery in the last three episodes is especially well done. Female characters in particular were starting to show some nice characterization in chose-up. I had given up on that previously because of the highly stylized imagery - a deliberate choice, and one I was willing to live with. The "upgrade" in latter episodes was a welcome, and unexpected, improvement.
The thing that kept Tron in the background was a virus he picked up, something that weakened him and forced him to undergo constant treatment. This is why he was grooming Beck to lead the uprising.
Pretty much the same as for the series itself.
The linked article above hints that there might be hope, but seeing as the viewing time wasn't changed, and that the schedule was variable (both are hallmarks of a series that the network wants to go away), I have little hope that that will be the case. It's a shame. Given a chance, it does grow on you.
There's a petition, and rumblings that it succeeded, but I've seen nothing official.