They've already talked about this (and also showed, SOP last year).
Combat against humans is improved, you now have combos, special attacks, etc.
Same for traversal. No more yellow climbable spots manually placed, now this is procedurally generated (you can use your scanner to see where you can climb if you want but it isn't needed), there's also a hookshot and paraglider to climb/descend more quickly.
Combat against machines was already top tier so not much to improve there besides creating more of them.
To me what I watched from the trailers did not seem an upgrade
Any change to the combat against humans is an upgrade, in the first game it was non exists
If the weightless, messy chaotic combat against the machine was a top tier than I don't know what to say