Said Shigeru Miyamoto to the Wall Street Journal about Nintendo's organization structure: “We have to construct the structure so that it can make it without me. I should also admit that it might be better without me; I mean that a different approach and different talent might emerge, though I shouldn’t dwell on this because then the article might indeed say ‘Mr. Miyamoto is thinking about retiring,’ because that is not the case.”
This interview with Shigeru Miyamoto was conducted on Thursday. The mention of "retiring" seems like it might have been in response to a question about Wired's story from earlier in the week, although the Wall Street Journal writeup puts the response in the context of Steve Jobs' death, noting that analysts and investors worry that, like Jobs and Apple, Nintendo may have a hard time surviving without Miyamoto.
Here's a nice summary of Miyamoto Retiregate.