I guess the NX will be a handheld and home console (as guessed by many), but the home console will be able to use the processing power of the hand held.
The patent for using external computing devices points in that direction.
So the quality for local multiplayer won't be impacted as much when playing with 2-4 people, as the 3 extra processing units (the 3 handhelds) would be able to boost the performance enough to make it run in the same quality as the singleplayer.
Also it would make some 2 screen concepts more feasible, than on the Wii U, like installing a camera on a NPC and following him while being someplace else.
At the moment the graphics would need to be compromised heavily to make it work properly (e.g. Star Fox Zero), as the home console has to process close to twice the load. The extra processing power of the handheld could alleviate that.
Maybe the NXs power will be improveable by releasing newer more powerful handheld revisions/versions leaving the home console as it is.
Issues I see are the price and fragmentation of the console through different handhelds. Also handhelds aren't the best controllers, and the battery life would need to be pretty impressive to be acceptable as a controller.
The Gamepads (with the bigger battery) 5-6 hours and the Dual Shock 4s 7-8 hours are not really satisfactory, and they don't have built in APUs.
I'd be impressed if Nintendo managed to pull that off.
Platforms: Wii U, New 3DS, PS4, PC
currently playing:
-Yoshi's Wooly World
-Pokemon X
-Fire Emblem Fates
Zone: Europe (Germany)