Since the only way to obtain a WiiU gamepad is to take one from an existing system, this development will help revive old systems without taking from the limited WiiU gamepad market.
Skip to 2:28 if you just want the development info and not the context and history.
There are a lot of Android based Pocket devices out there like the retroid. Imagine having a retroid or ayn odin that can also double as a wii u controller.