Finished the Beta. Honestly had a lot of fun with it. My biggest take-away is that it is Nioh, with some added bells and whistles. There are two new weapons, a set of hatchets and a switch-blade which has multiple modes. Nioh 2 still shares some big issues with the previous games. There's an absolute gigantic amount of loot, and the game is still very stat focused. You can do a level-1 run with low gear, but be prepared that gear can make the difference between 10 second stomp and a 5 minute grind at a boss.
All weapons have gotten new moves and they are pretty interesting, complimenting what was already there. Some attacks are still as broken as before like Backwave, Iai, Sign of the Cross - you can very easily gimp the whole game.
What's most interesting is the Yokai Moves. You constantly build meter now which at max has 10 points. You can do three attacks with this, one you can never change. This one is a type of counter, which you can use to counter "dangerous" moves. The other two you can find throughout the game, with these moves you'll take on the form of an enemy and do their signature move.
This is really cool as these can be used as any time, so you can attack until your Ki is dry, and then do the Yokai-Hammer skill for instance. They all also have unique properties, some are high damage, others give debuffs, some are focused on knockdown - tons of cool stuff.
I really feel the game is designed with these in mind, since the game is already quite brutal in the early game. Expecting you to go nuts with these.
The only new mechanics that I see get a lot of hate is Yokai Areas. These are zones where you are gimped. Your Ki regenerates extremely slow in this zone. If all enemies in it are killed, the zone vanishes and these foes do not respawn. Most bosses can also 'trigger' this and it makes for quite the panicked affair. They probably did this to promote Ki-pulse and Sacred Water items more, but it feels a bit of a cheap solution to a problem. Still, interesting.
Over-all a fun experience and I'm looking forward to the full game!