At least in the immediate future, there will not be a new attraction in Tomorrowland, other than TRON Lightcycle / Run. Disney also has plans for plenty of other exclusive merchandise related to TRON, including personalized action figures.
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The attraction closed on 11th October 2003 to be replaced by Stitch's Great Escape. Description: The most frightening ever of Magic Kingdom adventures, this show places guests in the middle of a Tele-transporter demonstration gone awry, leaving them captive and at the mercy of an alien creature.