In their recent Q1 2016 earnings call with investors, GameStop CEO Paul Raines confirmed that Nintendo's upcoming NX console will use physical media, putting down one rumor that the console was going to be digital-only.
"It will have physical media, we will play a role in it, our pre-owned business will also play a role. So we're excited about that."
In regards to a related rumor that the NX will be returning to cartridges over discs, the GameStop executives had no knowledge of whether that would be the case. Discussing the differences between discs and cartridges, they noted that it would make little difference to them in regards to new game sales, but added that "cartridges are much simpler to refurbish and repackage. So there is somewhat a little bit of an advantage if it went in that direction on used."