Soundwave on 20 June 2016
http://www.neogaf.com/forum/showthread.php?t=1236846
Retailer GameStop basically confirmed NX will have physical media that they will sell, it also sounds like it's cartridges though they don't outright confirm it they mention specifically cartridges are better for their resale business, which is a pretty big tip off.
Which is nothing terribly shocking, many people have called 3DS like cartridges for a shared platform for ages now, but it looks like the people who were saying digital only were wrong.
