I just don't subscribe to the theory that this is obviously a Sony deal. Is it possible? Sure but why does it HAVE to be a Sony deal? Could it simply be square enix wanting people to double dip so they are being vague about pc version or the pc version is not ready and they want to maximize day 1 sales. Did Sony/Microsoft pay activision/WB/Rockstar to delay or not talk about pc versions of games like mortal kombat/ injustice 2, destiny, rdr2 etc....I... don't really see how you can believe no deal has been made.
Not an expensive one obviously, but one made so some people double dip, or just go for PS4 first for their niche game. It's nothing really surprising.
All I am saying is that it is possible that the publisher is the one being vague and pushing PS4 version and Sony didn't go out of its way to pay for a niche game like nier when the other version was already announced.