It's been heavily speculated that Nintendo would move to cards for NX game media, based off comments Macronix have made about NX being a major future contributor for them as well as the cross device shared software theory. If an NX console and an NX handheld can play the same games a card rom makes more sense than an optical disc.
I also recently discovered by looking through their
QR reports that Macronix has a 32nm XtraROM production line in the testing phases being readied for mass production later this year. XtraROM right now is pretty much only used for 3DS game software (not flash), it's not even sold through retail supply vendors and it uses a 75nm production node. I feel like the obvious takeaway here is the new line's likely being developed for higher capacity roms for Nintendo.
Speaking of which, previously Macronix had suggested to investors that NX would release later 2016. I think they have their ivestor meeting/call next week so I wonder if we'll get any update on NX's impact to their business?