Seems like they"ve got some sort of EyeToy-style device in the works, at least
Are Nintendo working on an EyeToy-style camera for Gamecube? That"s the question that"s sweeping the net today after it was revealed that the company has trademarked names and logos - which you can see to the right - relating to the phrases "Manebito/Camera" and "Ningen copy/Manebito". "Ningen copy" translates from Japanese as "person copy" while "manebito" means "someone who imitates".
As for the two logos, they do hint that, if Nintendo are indeed working on a Gamecube camera, that you"ll be able to use it to transpose your own face on to those of in-game characters. Also, if you look closely at the second logo (click on it to see a larger version), next to a little videocamera icon is what appears to be a Cube icon inside the second kanji character. Intriguing.