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I believe that the Blu-Ray's are actually 6.1, which is essentially a regular 5.1 mix with an added mono rear channel that would mean that the two rear speakers in a 7.1 setup would have the same output. I don't have a 7.1 setup so don't know what it sounds like separated, but DTS-HD MA tracks should be matrixed down to 5.1 when played through a 5.1 system so you hear those elements mixed with the other surround elements anyway.
I don't know specific details about the blu-ray mixes, but the audio has been given the same treatment as the video and has been tweaked again so it must be a new mix with a true 6.1 channel map.
The 5.1 mix from the DVD was an entirely new mix made from original elements, but is Dolby Digital EX, meaning it can be matrixed up to 6.1 or 7.1.
Its quieter than previous mixes because of hiss-removal. Its also a bad mix, surround elements are on the wrong sides in places. The 5.1 mix from the '97 Special Editions is the best 'official' 5.1 mix I've heard, but was only released on LaserDisc.