They said it was someone from with NOA.
The whole thing doesn't add up though. Would Nintendo really go through that kind of a PR nightmare if they were already done?
And if the localization process was completed before E3, why not show it there? It would have been overshadowed by the Wii U, sure, but if they announce it now it will probably be crushed by the November releases. Deliberitly missing an important opportunity would mean they had anticipated some alternative, like a big backlash from fans... and that's just ridiculous.