It’s darkly amusing to me that I’m already reading stuff about this release, like re-composited effects shots and alternate dialogue takes, that means it won’t pass some peoples’ purity test.
From what I’ve read, it doesn’t sound like they’ve recomp’d anything but simply gone back to the finished VistaVision interpositives.
Even the alternate dialogue takes, while not staying true to how the films were originally heard, are apparently only being used for a new 7.1 track. While that would make the audio less of a strict remaster and more in the nebulous category of “restoration,” the earlier stereo and mono tracks are said to be earmarked for inclusion on any eventual disc release as alternative options.