I don't know, I don't think it's an official confirmation or anything. He has just said what Square would have said without any official announcement, he wouldn't ever confirm the Western release in such an occasion, and at the end of an interview with a Western site,where the most important things have been said besides the last words to the fans...the Western fans.
But aside that, I firmly believe this will come over here due to it being a game with probably a good budget behind and, above all...it has SpotPass implemented in one of its most important features, the town-building one. Having just StreetPass would have shown they weren't interested to the rest of the market, given how handheld are carried everywhere in Japan while the same can't be said about us, and so it'd have handicapped one of the strongest component of the game for the other side of the world.
That would all fly just fine if someone actually asked him about the localization, but he brought it up himself.