Nintendo unveiled Wii U at E3 in June without a single official first-party game to demonstrate it — attendees had to make do with tech demos like New Super Mario Bros. Mii and Zelda Wii U. If you were wondering why there wasn't a more concrete showing of upcoming games, it could be because Nintendo's legendary secrecy extended even to its own top employees.
As a developer at Nintendo, I had some information about the new system, but I didn’t really have all of the information prior to the announcement at our presentation. I only knew some of the things that were considered to be safe.
Koizumi knows about the console now though, and you know what that means — he and his team are working on a Super Mario game for the machine. We can't wait.