They are at a higher bitrate. They restore the fanfare at the beginning of “The Last Battle” and unswitch the music in the rear channels of Star Wars… other than that, they're mostly just more and more revisions (“Nooooooo!”).

You seem to be valuing the bling over the content. Yes, it's nice to hear stuff zing around your home theater, but if a movie wasn't mixed that way in the first place, it wasn't mixed that way in the first place. There are so many problems with the balances and dynamic range on the DVD and Blu-ray tracks (I am particularly sensitive to what's happened to the music) that I am quite content to listen to hairy_hen's outstanding restoration of the original theatrical 70 millimeter six-track Dolby Stereo mix. I also happen to have a warm place in my heart for the 1985 Dolby Surround mix.

I stand by what I said. If you're not satisfied with that sound mix why don't you try building your own? Everybody who is working on a project here started somewhere.