UPDATE 20/5/21: Bandai Namco has now officially confirmed Ni No Kuni 2: Revenant Kingdom for Nintendo Switch, and given it a release date of 17th September.
As detailed in the earlier ratings board leak, below, this will be the Prince's Edition version of the game with both of its major DLCs included: The Lair of the Lost Lord and The Tale of a Timeless Tome. You'll also get a collection of items, including a "Proper Tidy" ring themed around the game's fairy helper.
Here's a look at all that in action: