With the mobile endeavor, I'm wondering if Ninty will finally make the switch to a capacitive touch screen, mainly to allow for ports (especially if they create big hits). I was suspecting they would before the announcement, but this almost seals it for me.
I suspect NX will be a core focused system with the most 1st/2nd party support of all time, but will give those Ninty mobile fans what they like as well. The touchscreen will be less of a focus on NX and probably marks Ninty's return to a single screen. Dual screen experience will be exclusive to Fusion, which will be not much more than what Wii U gamepad offers (map, inventory, apps etc).
With all these standard, off the shelf parts it leaves Ninty room to gamble on another gimmick or even give us more power than most would expect.