Remember to turn off autosave if for some reason you must buy and play SwSh. If you don't your SD card can be wiped and save data for any games with no cloud saves such as Splatoon, Smash, or Mario Maker may be lost
Proofs: http://blog.esuteru.com/archives/9412890.html (in Japanese)
There's also reports coming in just now from western sources so it's not a Japan only issue.