1) Tron Legacy is a sequel, not really a "re imagining"
per se.
It's cyber space world is on a hidden away, isolated computer system where the Programs and their realm have sort of developed and virtually "evolved" for over 20 yrs which in the cyber space realm has been a virtual 1000-2000 "years".
2) I predict Tron Legacy will be as good as the original just it's "vibe" is a little different, slightly darker, leaning more toward the tone of "Blade Runner".
3) Many many fans of Tron have wanted and dreamed of a modern day sequel for these past 28 yrs.
4) Bruce Boxleinter is back as Alan Bradley as well.
5) the orginal Director/Co-Writer of Tron, Steven Lisberger is Producer on Tron Legacy and was closely involved in production and also had a mentor-like role so he's has put alot of his own input into the sequel.
I'll let these address the rest of your post:
http://www.youtube.com/watch?v=zmNL4QrUv5ohttp://www.youtube.com/watch?v=-0ZE9RTklm4
though I recommend you watch all parts of that interview/discussion with Steve Lisberger.
And this viral marketing/Alternate reality game/events is totatly appealing to many fans of the original Tron:
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