The Nioh beta is linked up on the PS Store, but it's not yet downloadable: https://store.playstation.com/#!/en-us/games/nioh-beta-demo/cid=UP4108-CUSA05892_00-NIOHBETADEMO0000
Koei Tecmo is tracking the status on Twitter: http://twitter.com/KoeiTecmoUS/status/768134150943485952. Hopefully it's...