There isn't going to be another Nintendo console in the way you guys think.
Nintendo is waiting for handheld mobile tech to catch up to Wii U level performance. When that happens and is cost effective, they are going to launch a portable platform which they can port Wii U games/engines to.
Then they'll be able to make the same game and release it on the new Nintendo handheld and the Wii U if they want at the same time.
See Iwata's quote:
http://www.nintendo.co.jp/ir/en/library/events/140130qa/02.html
In this perspective, while we are only going to be able to start this with the next system, it will become important for us to accurately take advantage of what we have done with the Wii U architecture. It of course does not mean that we are going to use exactly the same architecture as Wii U, but we are going to create a system that can absorb the Wii U architecture adequately. When this happens, home consoles and handheld devices will no longer be completely different, and they will become like brothers in a family of systems.
Still, I am not sure if the form factor (the size and configuration of the hardware) will be integrated. In contrast, the number of form factors might increase. Currently, we can only provide two form factors because if we had three or four different architectures, we would face serious shortages of software on every platform. To cite a specific case, Apple is able to release smart devices with various form factors one after another because there is one way of programming adopted by all platforms. Apple has a common platform called iOS.
Think an ARM-based/smartphone GPU powered Nintendo tablet and a similar chipset for the "home console" too.
This is going to take some time for game fanboys to wrap their head around because it's not going to be the "new console" they think it is.