They could have multiple form factors, Iwata did say unifying could allow them to have say 3 or 4 form factors instead of the traditional 2. 

NX Hybrid Portable Console - 400-500 GFLOPS, new concept high end mobile console that can double as a home console in a pinch but is a premium portable, top of the line type device in that category. $259.99 MSRP. For the person who primary wants a mobile high-end console, but doesn't really care about 1080P graphics on the TV and doesn't want to buy two seperate devices. Enjoy your games on the road and at home. Move your system around room to room if you want. Available Nov. 2016. 

NX Micro-Console - Could be the same exact chipset from the above hybrid device, just as a small microconsole. Since there's no LCD or battery cost, this would be dirt cheap. Perfect for cheapos as a budget entry point into the NX ecosystem. $169.99 MSRP. Available Nov. 2016. 

NX Pro Console - The most premium version of the NX, same family of CPU/GPU/RAM as the two units above but scaled up to 1.5-2 TFLOPS 1080P TV resolution and highest graphic settings (for those devs that want to use it). Has HDD. Aimed for hardcore gamers. $299.99 MSRP. Available Spring 2017. 

etc. I could see that having some merit. 

Nintendo has the chance to make sure the chip inside their next console is 14-16nm with FinFETs technology (3D transistors that cut power usage by 50% or so). Compaired to the 28nm chips both the Xbox One & PS4 use.

Nintendo also has the option to use Hybrid Memory Cube techonogly (many times more bandwidth than GDDR5, and lower power consumption).

Nintendo just need to make sure they design the chip right.
Small and cheap, 16nm FinFETs with HMC tech, that ends up slightly faster than a PS4.

Prey they dont spend 100$ on the f***ing gamepad.

(this is the main opstical, how cheap are they willing / able to make their gamepad, the cheaper the better).

(its not viable to use 100$ on a controller when the competiton is useing like 15$, and release a console that performs the same at the same price)

I don't expect anything major. What I would do would be something different but what I expect Nintendo to do is a 300 GFLOP-ish portable device that is something new and different. Perhaps it can also stream to the TV itself for people who don't really care that much about graphics. 

Then it will maybe have a higher end console version of that that's maybe 700 GFLOPS (2x+) or something for people who want slightly better graphics. Hardware split will be 4:1 in favor of the portable wunder-machine.  

Third party support will largely be current 3DS and Vita support mixed into one, with some PS4/XB1 ports, the less graphically heavy games that are possible. And it will run Android apps on a custom Nintendo OS, like Blackberry does. And Nintendo will take a small cut/fee for these Android games. 

Keep in mind most Nintendo teams have just only made 1 HD game using the Wii U thus far, Sony/MS had 6-7 years with the PS3/360, I don't think Nintendo is really all that interested in jumping up a full hardware leap from Wii U when they've just only started with HD development.

Except that market is shrinking faster than the speed of sound and can no longer be viewed as a viable one long term. There is a reason why Sony has recently said there is no climate for a Vita 2. There is still a market for home consoles though and home consoles need to have some beef on 'em. With handheld market evaporating Nintendo cannot delegate itself into the role of a secondary option, lagging behind competition and begging for any sort of attention.

It wouldn't be hard to beat the X1 in power if Nintendo keeps the $300 price-tag for the home form-factor.

Unless Nintendo doesn't go x86, then outperforming the X1 is a given, and matching the PS4 seems likely, especially if they go with a newer AMD APU that outperforms Jaguar.