Square Enix going to release on March 29, 2017 in Japan the NieR:Automata Original Soundtrack which release with selected NieR tracks from the game.
The price will be 3200 Yen + tax and it comes with 3 CDs.
If you pre-order it you will get an extra soundtrack album the NieR:Automata Original Soundtrack HACKING TRACKS. This album going to includes all the 16 BGM tracks of the game! It will be available only with the pre-ordered version NieR soundtrack album.