Didn't seem to matter in my case. I think I was signed into my US account, when I did it.Anyway, I have a question: do I connect it to the Japanese iTunes first, or to the US one? I have accounts on both but I am wondering if it begins some kind of register process.
ps. love that Björk video, BTW! I actually have it on DVD (part of the Micheal Gondry/Chris Cunningham/Spike Jonze set) ... and you're right - the white is very similar to those androids, but look out for the Apple logo!! It's VERY easy to scratch.