A demo for Balan Wonderworld is in the works, Square Enix announced today. It will release on January 28.
We assume that all regions will have access, but Japan is the only officially confirmed territory for the demo at present. If it isn’t made available in the west, you should be able to access it on your Switch by setting up a Japanese Nintendo Account, registering it with your system, and accessing the Japanese eShop.
Balan Wonderworld’s demo will include access to the first two acts and boss battle for Chapter 1, first act of Chapter 4, and first act of Chapter 6. The Isle of Tims hub area is included as well. Local multiplayer is also supported.