After the 4.0 update launched on Switch, a Twitter user by the name of Master Mewking discovered that the Wii U GamecCube controller adapter now works with the system.
So, yes, you read that headline correctly: play The Legend of Zelda: Breath of the Wild, or any Switch game for that matter, with a GameCube controller.
Since Nintendo made the Switch compatible with GameCube and didn’t release the information, could this mean they’re planning something to utilize the controllers? Two ideas come to mind. The first being a Super Smash Bros. game coming next year, and the second is GameCube virtual console. Honestly, I think the second is more likely, as Nintendo is getting ready to launch their paid online and will likely have Virtual Console ready for that.