http://wccftech.com/nintendo-switch-4-0-0-gamecube-controller/

Last week, Nintendo introduced several new features to its Switch consoles with a new firmware update. A few hours ago, it’s been discovered that the Nintendo Switch ( Amazon, $299.00) 4.0.0. firmware included another rather interesting addition.

According to online reports, the latest Nintendo Switch firmware update introduced GameCube controller adapter support, which is a very interesting addition, as it may have been introduced to pave the way for an updated release of Super Smash Bros. for Wii U, which was rumored to be in development but never officially announced.