Nier: Automata was announced in Los Angeles during Sony's press conference at E3 2015, and since then we haven't received much more information about this project, apart from the fact that it was recently delayed to 2017, and that the main campaign will last more than 25 hours.
We already knew that the game is expected to debut on PS4 and PC (this version was announced during this year's E3), but for the moment there are no plans to publish the game on Xbox One.
This was confirmed by the producer Yosuke Saito during a recent interview with RPG Site, and he said:
"To be quite frank with you, it was a lot of work last time to create two versions with different characters and such! I do think we were able to gather up a really great team of people to work on this title this time, so I didn't want to split their focus. That's why we wanted to just do one version this time - that was decided from the get-go."
"So, I think this isn't just our company - I think a lot of other companies also do it - but we actually start creating our games now on high-spec PCs and then optimize for the different consoles we release on. Since we already thought about releasing on Steam from the get-go, we'd already built the game in such a way that it would play on PC."
"As I said, this is especially so because we've heard in Europe that there are a lot of PC gamers. To port that over and optimize it for Xbox One requires a number of extra steps. I think that is way too much for us right now, so we've decided to only go for the one console platform."
Nier: Automata will be available in early 2017, although the final release date hasn't been announced yet.