Couple of things I also noticed from the Gameplay:
1. Energy regenerates much slower now compared to the 35minute demo. So thank fuck for that.
2. Looks like you can parry either infinitely, or a lot (Confirmation on information we heard a couple months ago) as it doesn't seem to use up any energy or have a cooldown. Not very happy about that.
Looks like it depends on Geralts stats. I saw it one of the clips rapidly regenerating.