NeoGAF forums user "Trike" dun goofed while trying to exit the Miiverse on the first day of the console launch, pressed a button, and opened up a debug menu. It seems pretty normal, but then you look at the games discussion pages by devs.
What games do you see here? Metroid, Zombie,(Most likely ZombiU) The upcoming Wii Fit U, but wait, what's this?
YOSHI LAND/ISLAND U.
Okay, after that, lets keep going. Soul Hackers? Never heard of it. Resident evil? Cool. Look down one more, and what do you see?
FRICKING METAL GEAR SOLID.
NEOGAF LINK:
http://www.neogaf.com/forum/showthread.php?t=500411 I'll post more photos if you guys like.