Nioh 2 has a release window. A Tokyo Game Show 2019 trailer was temporarily uploaded that said it would be coming to the PlayStation 4 in 2020. It has since been pulled. (Thanks, Wario64!)
Here is a mirror of the pulled Nioh 2 TGS 2019 trailer. In addition to the release window, it also shows in-game footage, some cinematics, and offers a look at some of the characters and yokai we will meet and face.
Nioh 2 will come to the PlayStation 4 in 2020.