This thread is amazing.
Originally Posted by SkullplateMurray
Eurogamer has official word from Nintendo (via GamesIndustry):
"It has come to our attention that some people were able to access a mock up menu on Miiverse following the launch of Wii U in the US. Please note that this was only a mock up menu and has now been removed and is not accessible."
Of course it was Nintendo, we all believe you.