WiiU GamePad firmware was already dumped and decrypted earlier this year (it is probably the Micron 25Q256A). A bounch of people already reversed it mainly because it is stored unencrypted. The .bin file is already available on the web so I think that soon we will know how to access this "secret menu" and also something "FUN" seems to be in the finishing straight so... STAY TUNED !!! 30C3+f0f are coming to a WiiU near you !!!