Some running thoughts as I'm watching this, coming from someone that's only played Gen 1 and 2 so far. Any vets reading this, please let me know if I sound stupid.
Aerial movement looks interesting - I haven't had the chance to play Gen 4 or 5 yet, but footage I've seen doesn't seem to look like the first few seconds of this. The deliberate sideboosters, etc.
Liking the look of the speed of combat. Looks like it plays faster then what I've experienced so far, but slow enough that there is still some deliberation. Melee options that aren't just a sword swipe looks very cool.
Not sure if that miniboss encounter is beefed up MT or an enemy AC, but as before, I'm really liking the look of the speed of combat. There are clear telegraphs to a lot of the moves to enable some Souls-like learning of encounters / enemies. Combos to lock enemies down that aren't just 'repeatedly hit them with the biggest, fastest firing gun you have'.
Full blown boss fight cements these feels for me.
This is probably a day one purchase for me, looks really, really cool.