Last year I bought the dvd and was simply gobsmacked at how well it still holds today. No wonder that the dvd was so well done as the same folks who did LOTR EX ED.
anyway I found the following website
http://www.tron-sector.com/articles/article.aspx?ID=145 with an interview with Harrison Ellenshaw who also worked on SW plus there is also news on CineFantastique's Aapril / May issue on 20years of Tron.