They already said, that the minimum and recommened requirements will not change. So i do not believe, that there will be noticable graphical improvements.
Cheers
I know it's unlikely that anything will be changed at this point, but they did make some minor changes for 7.5, so I can't fully give up hope. I would just like to take a moment to lament the m elezen mouth. I use mouth 3, and the curves are very different from how they were (not sure about 3/4, but face 1 has this problem too).
I think the makeup diffuse on m elezen face 102, the upper lip looks very pointy compared to the endwalker version. And the lower lip is a bit thinner and wider, but I don't think that one is a texture issue. It's very noticeable when he smiles, like in the third set of images, so I think it's probably due to the bone placement/animation.
I also don't like that the shape of the eyes (eye option 3) is subtly different (the inner corner/upper lid particularly), changing his vibe completely.
6.0 vs 7.5:
https://i.imgur.com/oWTTfwz.png https://i.imgur.com/7l6GHzg.png
https://i.imgur.com/J6Yiypu.png
https://i.imgur.com/oU9Dz8L.png
https://i.imgur.com/ycu1g88.png
https://i.imgur.com/pxRgViC.png
Anyway, I wish I had known where to find the old Endwalker benchmark back when DT released, maybe this post might've made a difference then. Alas.