Soundwave on 04 September 2015
Aside from the disc drive that takes up like half the Wii U casing on its own, the heat sink and the fan are the other two large components of the Wii U:
But if you remove or shrink those considerably by using mobile parts (like say AMD's 14nm FinFET which just happens to be available for 2016) ... a console that runs at 12-13 watts is definitely doable. At that range it wouldn't neccessarily be workable as the "standard" Nintendo pocket portable, but it could definitely function as a portable console for those who want it.
