English Patch notes:
https://imgur.com/a/dOCyT
I think I actually got most of the interesting changes back then…
They also reduced the duration of all the Dmg X2 and Nullify Dmg buffs, the one after Dash attack is so short that you can't do anything with an Odachi (and probably Axe as well)… Dmg bonus seems to be around 1.5 at least, so still rather significant.
It's 3 proper main missions this time, though the second one is rather short and there is no unique side mission map, but the final mission is probably the longest in the game. 9 Side missions (and 1 Twilight) so more stuff to go through compared to the previous DLCs. Well they did name the Hayabusa Ninja after all, but there is still a Mysterious Samurai to fight. Lots of Boss battles in general… and they were really keen on missions with NPC allies.
If you get the 2 Hayabusa skills, they are immediately learned, no skill points required. Izuna drop is Sword only, so I guess it technically got 2 skills as well.
You get Cracked Ochoko cups as Twilight Mission rewards (first clear), means up to 10 per day. They can also drop from enemies, though that seems to be pretty rare (maybe higher chance on Wise/Nioh, played through the content on Demon first)
Looks like they went for more unique set bonuses and fixed skills this time. The Shuriken bonus from the Hayabusa set is hilarious XD
Some stuff looks interesting…not sure if I'll change anything though.
Also raising Dex and Magic above 100 increases the respective capacity again. New stat cap is 200 not sure about Level cap though… could go all the way up to 1600 lol