There's no way it was Tron I don't believe it. I don't believe the Walt Disney Company would invest 100 million or more on a ride when the movie barely broke even with the budget. No way I'm sold on this. Pirates expansion is a lot more likely. Think about it. It's the only real franchise disney has except for toy story.
A few things to think about:
Plans for a Tron ride began well before the release of the movie. As evidenced by the amount spent on advertisement and promotion, Disney once had high hopes for Tron as a franchise.
Lots of attractions have been planned for movies that eventually 'failed'.
While Tron has barely broken even domestically, it is approaching 400 million internationally. This may not mean much to many, and the significance of this number can be easily argued, but it is something to think about. Also, I would argue that Tron actually did quite well for the genre, and Disney simply spent too much money on the project. If they had even cut the budget by 50 million (in theory), our conversation may be different.
If in fact Tron is definite for Shanghai, it may tell us if a Tron ride would be warrented for the US based on it popularity in China. After all, the ride may be popular despite the film and not because of it.
Electronica was actually quite popular.
Not every attraction needs a hit movie to have a popular ride. Look at Pirates for example...
The soundtrack and merchandise has moved pretty good. And we have yet to see how the dvd/blurays move.
At this point, Tron is the 12th highest grossing film having opened last year.