We have now heard a couple of times that the NX won’t use traditional discs and will instead be reliant on cartridges. This issue has cropped again by the USPTO in documents filed for Zelda: Breath of the Wild. The document states that The Legend of Zelda: Breath of the Wild will ship on both disc and cartridge. Clearly the Wii U version will ship on disc but the cartridge version of game remains unclear. We should know for sure later this year.
Thanks to those who sent this in.