I'll be doing that as well.
What I plan on doing is this:
Reworking the opening sequence to match Legacy.
Tightening up the editing.
Rescoring the film to match Legacy (as well as some unique electronic pieces for this one)
Adding in some basic effects (flares, a new derez scene similar to Legacy's)
Adjusting the contrast and colour of Tron to be closer to Legacy.
Adjusting the sound effects to be closer to that of Legacy.