Just a guess, but if you watch the making of documentary they have footage in 1.33 of Pheobe's nude scene at the pool that shows a bit more image on the top & bottom of the screen than in the 1.85 film itself so I would assume that it is an open matt on the "Full Frame" disc....but that's just a...
The previous DVD's audio was horrid, tinny, lifeless and hollow sounding, if this disc's tracks even improve the audio quality slightly then it will be worth it to me.