In the Making Episode 3 "Going to the Dark Side" featurette, there's a behind-the-scenes thing going on. You can see Lucas watching the HD screen, and there's this marvellous shot of Vader looking up wearily. Why the heck they didn't use it, I haven't a clue. Needless to say, at such small size it'd be impossible to reincorporate from the QuickTime movie - but it really is a good looking shot.
Just out of interest - how do you suppose the best way to remove 'nooooooooooooo' is? I can't imagine the movie without it, it's priceless in so many ways.... hah.