Very early in development at Platinum Games, Square Enix announced a Nier sequel at their E3 2015 press conference, with PlayStation 4 highlighted as the only platform.
More information is coming in Fall 2015, including details on the subtitle.
As said during the conference, “It will take a while before it’s ready.”
Update:
In the press release, Square Enix said the temporary name is NieR New Project and it’s a third-person action role-playing game that is a follow-up to 2010’s NieR.
Developed by Platinum Games, NieR New Project is a PlayStation 4 exclusive.
Square Enix talked about the star-studded development team:
The game’s all-star development team consists of producer Yosuke Saito (DRAGON QUEST X/NieR), director YOKO TARO (Drakengard/NieR), character designer Akihiko Yoshida from CyDesignation, Inc. (FINAL FANTASY XIV / BRAVELY DEFAULT), game designer Takahisa Taura from PlatinumGames Inc. (Metal Gear Rising: Revengeance), and composer Keiichi Okabe from MONACA, Inc. (TEKKEN/Drakengard/NieR). PlatinumGames Inc. will be amplifying the action-oriented combat and building a beautifully diverse visual experience that will fully harness the graphical power of the PlayStation 4 system.