Red Hook Studios has stated that Darkest Dungeon will be available on Switch from January 18th via the Nintendo eShop, with the price set at $24.99. Alongside the main game both the The Crimson Court and The Shieldbreaker DLCs will be available for purchase at $9.99 and $3.99 respectively. This version of the game will support touch controls, and the forthcoming The Color of Madness DLC will be released on Switch.
On a side note the studio has also confirmed it is not working on Android port of the game. To get more information about Darkest Dungeon you can read our review here.
Source: Official Darkest Dungeon site.