I read this article a few months ago, I think.
The only thing that is really outdated about it is mentioning that Brain Training "isn't selling ... blockbuster numbers."
However, that mention highlights how good of an article this is. Brain Training was the first in Nintendo's recent string of disruptive mega-hits, and it hadn't broken through yet. But this guy already understood Nintendo's strategy.
It doesn't need to be entirely in the context of new genres, though. While Mario Sunshine shows that even the biggest brand in history can only go so far when competing by traditional means of differentiation in a mature genre, Mario Galaxy will reinvent that mature genre. Everyone who is or ever was a fan of 3D platformers will be interested in Mario Galaxy NOT because it's "a new Mario game" but because of the revolutionary new mechanics. The fact that Ratchet and Clank might look better or have more content (traditional differentiation) will be irrelevant.
Meanwhile New Super Mario Bros. is a case where the genre had faded to a niche, and Nintendo was able to simply re-introduce an old genre king, and maintain the luxery of no real competition that a genre inventing game has. Link's Crossbow Training may do the same thing for lightgun games.
Questions ranging from "why does Nintendo say they will never leave the hardware market without leaving the software market?" to "why hasn't Wii Sports 2 been announced?" could be answered just by understanding this article.
"[Our former customers] are unable to find software which they WANT to play."
"The way to solve this problem lies in how to communicate what kind of games [they CAN play]."
Satoru Iwata, Nintendo President. Only slightly paraphrased.