The new skins look amazing.
That being said, the ult animation from Kayn is ENORMOUS, and IMO will take up too much of the screen in teamfight, especially if you are trying to target a champ that is behind the ult projection. https://youtu.be/W9Xi_ZM02j4?t=9
Also as a malphite player, his Q animation in that skin looks nothing like what his Q normally looks like, and it looks more like a linear skillshot, which could make it hard to determine what you are being hit with. https://youtu.be/YAL5PG2bTeY?t=9
Just some early stuff because these skins look great but as with all skins they shouldnt effect gameplay