Anyway, what's your point, they did showed a completed Nemesis FX and all in the theater?
I don't know that. It's highly unlikely, but not impossible that some preview version accidentally got out there ... who knows!
My point is that we have no idea how finished or unfinished any of the deleted scenes from Nemesis or any other Trek movie were. Sometimes unfinished scenes are being put into the deleted scenes section just to prevent people from editing them back into the movie on their own. Sometimes deleted scenes are deliberately reduced in quality for that purpose only.
Some of the scences that have been cut from Generations and Nemesis seem very much like last second cuts to me ... but that's of course pure speculation on my part. There are probably people around here who know better.