https://www.polygon.com/2018/7/26/17613902/ni-no-kuni-2-revenant-kingdom-dlc-release-date-season-pass

The first wave of downloadable content for Ni no Kuni 2: Revenant Kingdom will launch on Aug. 9, Bandai Namco announced. It won’t be exclusive just to owners of the season pass, however — the initial DLC, the Adventure Pack, will be given away to all Ni No Kuni 2 players.

The Adventure Pack will introduce additional quests, bosses and costumes. While players should be able to access some of the new additions before completing the game, the quests will only go live after finishing up the main story mode.