Tron Legacy is not a remake and could end up being the second part of a trilogy according to the current Total Film magazine.
I too love the original Tron but would not say it is a masterpiece - it is simply great 80s fun like The Last Starfighter ot the Black Hole. I for one am looking forward to the new movie.
Though we are not now that strength which in old days moved earth and heaven; that which we are, we are; one equal temper of heroic hearts, made weak by time and fate, but strong in will to strive, to seek, to find, and not to yield.