Ni No Kuni II: Revenant Kingdom is well on its way to selling a million copies this year, as Level-5 has reported that the game has sold over 900,000 units worldwide and that the series has sold 2.8 million units total over its lifetime. The news broke on 4Gamer, who reported that the game has been doing well with the PS4 and PC releases and that a soundtrack for the game is on the way.
Here's a snippet from the article below giving some of the details as to what it will have on it and the cost, but no details beyond the Japanese release info. Looks like Ni No Kuni II: Revenant Kingdom is set to do well beyond its regular shelf-life.
Mr. Joe Hisaishi was in charge of music "Ninokuni II". Original soundtrack that contains the famous songs will be released on June 6, 2018 (Wed)! First edition enclosed privilege of domestic version comes with a special sticker! Please enjoy the music of the gem.
● Title: Ninokuni II Revenant Kingdom Original Soundtrack
● Music: Joe Hisaishi
● Release · Distributor: Avex · Entertainment Inc.
● Release Date: Scheduled to be released on June 6, 2018 (Wed)
● Price: ¥ 3,300 )
● Product form: 1 set
● First time enclosed privilege: Ninokuni II Revenant Kingdom Special Sticker ※ 1 kind of all 2 types randomly enclosed