just commenting some popular points:

-mocap for cutscenes
There were some clips during one of the 14 hour streams showing that motion capture is used (again?) since at least Heavensward, although mostly for combat animations (both player and enemy). But there were also some cutscene examples, like Exdeath getting succ'd into the void or the Lise vs Fordola duel during early Stormblood MSQ.
Also cutscene quality has already improved greatly during the last few patches, gotta give that to the devs

- butts
that's still just different (better?) character lightning. Miqo'te butts were just as flat in 1.0, you just had some extra shading emphasising the curves and thus making it look bigger