To understand what is going one, it is probably better to say that in the Nier family you have Nier Gestalt, released on Xbox 360, Nier Replicant on Playstation 3 (both of those games are mostly similar but have some little differences) and more recently Nier Automata.
And for people that have no idea of what is Nier … well it is a third-person action-RPG, sets in an apocalyptic future (a bit in ruins), with a lot of monsters to kill. Like really big and very hard to kill monsters, but the universe and story are usually really worth it. Nier Replicant also has a lot of jump in time, so the story is in a very long period of time. Explaining more than that would either spoil the story or require a 10 minutes explanation.
So now it is probably more clear that Square Enix has decided to remake Nier Replicant for Playstation 4, Xbox One and PC. It is supposed to happen this year but I have not seen a date yet.
But for those interested to play what happened before Nier Automata, that is cool. As a reminder NieR:Automata will also be available April 2nd, 2020 on consoles with Xbox Game Pass memberships.