Nintendo has released a demo for WarioWare: Get It Together! via Nintendo eShop, as well as a Japanese overview trailer.
Here is an overview of the game, via Nintendo.com:
Microgame Mayhem Comes to the Nintendo Switch System
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Take on over 200 quick and quirky microgames—lightning-fast minigames filled with frantic fun—solo or with a friend! When his latest harebrained business scheme goes awry, Wario must use his signature style (and smell) to fix it.