As reported by VGC, the small print featured at the end of the Switch 2 GameCube trailer reads, "The controller is only compatible with Nintendo GameCube - Nintendo Classics," seemingly confirming that the gamepad won't work with any other Switch 2 games.

I love achievements in video games. I remember playing Call of Duty 2 on Xbox 360 and getting my first one and thinking “Oh this is neat!” And over the last 20 years, I’ve grown to enjoy them more and more as they have become a digital scrapbook documenting my gaming accomplishments across different platforms.