PSA: those who want to import the Japanese Premium Package, from the official website it looks like that version will be exclusive to the Konamistyle store. The chance of it becoming available at amazon.co.jp, Play-Asia, Nippon-Yasan etc. becomes significantly smaller because of that.
Some import sites do sell Konamistyle items such as Nin-Nin-Games, but expect to pay lots of $$.
If you really need the Japanese premium edition, sign up for Tenso.com now if you haven't already, and make sure you get your account approved (you need to send them proof of ID and address because of Japanese law, this can be done simply by uploading an image to their site, they will review it and approve your account if the documents are OK*).
Once your account is approved, you get your own Japanese address that you will be able to use when pre-orders go up at the Konamistyle website. Obviously you will have to fill in everything in Japanese, so use google translate or something.
* You can censor any details that are irrelevant or you don't feel comfortable sharing, they just need to confirm your name, date of birth and address