So this is an incredibly peculiar situation. One Wii U owner has seemingly obtained access to some sort of Wii U debug menu, and it contains rather interesting content.
From NeoGAF’s “Trike”:
Well, I was messing around in Miiverse trying to find out how the hell to do the initial set-up of my friends list to no avail. In doing so I accidentally found the “debug” menu on Miiverse. At first I thought, “Hey, neat!” thinking it was just a legit secret or something. I can even access something with the name “prototype” that seems to be the actual prototype Miiverse in Japanese. Apparently John Lennon is still alive and is posting on the Japanese Miiverse. Most buttons that I tried don’t work (Acid_Test?) so I thought, hay, maybe GAF could have fun with this or translate it. That is when I found the admin list.
At first it asked me to sign in, because my login information didn’t match. Then I pressed a button and it sent me to a list of admins anyway. They had buttons in the same row as the names, and I could “regenerate password” or “Delete Admin” or something along those lines. I didn’t do it it because I didn’t want to risk getting my god damn Wii U banned on day 1.
As shown in the gallery above, Trike even managed to come across a list that mentions “Yoshi’s Land Wii U”. Obviously that doesn’t confirm such a game – this is apparently just a debut menu – but man, again, this is all quite interesting…