Helloplite on 08 May 2017
Not sure how credible this is, but it does make sense. Also, that would make the Gamecube controller the longest supported console controller of all time AFAIK. Thoughts?
"Wii U Pro Controller and GameCube controller Support – In order to support the Super Smash Bros. release this fiscal year, Nintendo will enable compatibility with Wii U Pro Controllers and GameCube controllers, with a new USB adapter for the latter."
https://gamersplash.com/2017/05/01/nintendo-switch-new-features-coming-to-the-system-rumor/
