nightshade2013: Wasn't this made because they weren't going to make a second tron movie but had a completed script for it ? and then a year or so after this they actually made the movie just with a slight change or two ?
Disney had various versions of a TRON sequel film script kicking around for years and years. What became TRON 2.0 in video game form, was originally supposed to be a film. To then be followed by a TRON 3.0 film and game combo.
Since TRON 2.0 didn't do as well as Disney wanted, TRON 3.0 was scrapped. Then, around 2007 - TRON's 25th Anniversary - Disney revived the idea of another film. At first it was going to be a full reboot, but fans protested and they backed off on that plan. So instead they went with a sequel. (But it was really more of a "soft reboot".)
I think after both playing TRON 2.0, and watching the TRON Legacy sequel (and for that matter, playing the TRON Evolution game), it's pretty obvious that Disney liberally borrowed from TRON 2.0. Cherry-picking whatever they liked, but relegating 2.0 to "alternate universe" status. (Even after 2.0 was originally declared the "official sequel" by Steven Lisberger himself, a few years earlier.)
Much like Disney recently did with Star Wars: Rogue One. Cherry-picking what they liked from the Dark Forces and Jedi Knight games from LucasArts, as well. Thereby rendering the games null and void in the process . . .
P.S. I don't care what the "official" status of the games is. To me, they're all still part of the TRON and Star Wars continuities. Disney and LucasArts were willing to sell them and bill them as official at the time of their release. Disney doesn't get to wave a magic wand now and pretend they don't exist any more.