It's been reported that Nintendo have suffered a large data source leak, seemingly from earlier gaming generations and including Wii source codes, gaming ROMs and testing scripts. The leak looks to have come from a hack of BroadOn, a company Nintendo previously hired.
"As you may be aware, in the last few weeks in 4chan multiple Nintendo-related old things have been leaking, starting with old Pokémon debug ROMs and source code, then most recent 3DS debug ROMs, then keys for all consoles up until the DSi and now the biggest of them all: the full source code, design files, documentation and pretty much everything used to create the Revolution, aka Wii." ~ user Atheerios on ResetEra
How did this leak happen?:
It seems that BroadOn, a company that Nintendo have previously worked with for developing games & hardware in the past suffered a data hack and servers were breached - releasing datasheets, source codes, documentation, gaming & design details and more including "Gamecube and iQue stuff", Pokemon game content and demo's like the one above we found on Youtube, with more appearing on the internet every day and some early Nintendo 64 demos also being released.
We expect more news and comments from Nintendo to surface in the coming days & weeks.