I just read wikipedia's entry on the film in order to sort through the various versions. Apparently, the "director's cut" on DVD now, that come out in '92, was a rush job that, while done under the guidance of Ridley Scott, still didn't make him completely happy, as he was simultaneously working on other things (Thelma & Louis, if you can dig that).
So the Final Cut is basically the full, "real," director's cut.
The upcoming release will come out in all DVD formats, including the high-def ones, and there will be a 5 disc set with all the versions and extras.
As much as I love the movie, I don't want to spend so much money on one flick. (Dawn of the Dead is my favorite horror movie of all time, but I opted for the cheapo single disc version, not the 4-disc set). Also, I'm afraid of investing in new DVD releases of my favorite movies until the high-def format war is over, because I'd be into that but not while there are two.