Biomutant and Darksiders II: Deathinitive Edition will be released for Nintendo Switch if we stick to the information we can see on EB Games Canada website.
Both Biomutant and Darksiders II appear listed for Switch, and even Darksiders II: Deathinitive Edition shows a release date, in concrete, the product page lists the game for an August 30 release.
On the other hand, Biomutant does not yet have a release date for any platform. The game is officially announced for PlayStation 4, Xbox One, and PC.
Stay tuned.