Tron 2.0 is in a place in Hollywood called Development Hell. The director of the original Tron has submitted a script and Disney has expressed interest in the film, but nothings committed yet. From what I understand, the directors all hot to go but Disney has reservations about the script (basically a rehash of the first movie with more Internet lingo and a younger, better looking cast of characters) and the budget.
The script is being bounced around a bunch of different writers. If any of the seventy-eight re-writes results in a good script that fits Disneys budget, this one is probably a go. Eisner was really hot on this one for a while (he saw sequels lined up by the dozen), but his interest has cooled after having to write all those checks for Go.com. Funny how hes not really into things computer-related these days.
And thanks, wdwguide.