ソースはYoYo Games公式
https://www.yoyogames.com/blog/479/nintendo-switch-open-beta-now-available

We are now at the open beta phase of the GameMaker Studio 2 Nintendo Switch licence.
Its full commercial launch is expected in September 2018.
With the GameMaker Studio 2 Nintendo Switch export, GameMaker Studio 2 games can be exported directly to Nintendo Switch.