Your not crazy, Disney hasn't said anything officially about a second season yet. Most tv shows fait has already been announced by this point. For example, Motorcity was officially canceled before the final episodes where aired, they still aired them, but the viewer already knew it was cancelled for sure by that point.
There is still allot of hope, Disney is already Working on Tron 3 the movie, and they recently gained control over Star Wars the Clone Wars tv show, so they very well can create there own animation block on Disney Channel using both these shows together to take more control over that teenage boy market. They can use uprising to cross promote Tron 3 as well.
Canceling Uprising now would be ending things too soon, I honestly feel like they wont say anything for at least the next few months regarding the series.
As for the show creators, I think there hoping that fans will drive Disney nuts asking for more Tron Uprising with a cliff hanger like that, hopefully this works
Hell I would even take a few hour long animated movies similar to the Batman/Justice League Franchise that gets released on Bluray and stuff.