Apparently that's only for the Nintendo Switch version of the game.
NintendObserver’s select content on NIS America.
Bonus physical content exclusive to the Nintendo Switch release.
Surprisingly enough, that hasn't been announced on other consoles.
Where all of the NIS America games previously mentioned where actually announced.
The demo is now available in Europe as well.
I've only included information on Nintendo platform titles. Disgaea 5 Complete gets its Nintendo Switch release date.
The game is coming to Wii as well as it was originally intended to be.