Few notes
Yes it will by default be set to Japanese but you can set it to any other language in minutes (ask me if you don't know how to)
Keyboard will obviously have Japanese characters in it in addition to English ones
A set of OEM international plugs for the power adapter will run you about 30USD (or maybe 20 in eBay)
Yes, if you want to buy in a store an official Apple Store will be cheapest
Doesn't matter Ginza or not, same price in all the Apple Stores. For a complete list of stores visit
アップル - Apple Store - ストア一覧
Edit: Also, sorry, forgot to mention in original post. I would NOT recommend buying it now. I say that because in aprox a month the whole range may get a pretty good upgrade so you'll be getting alot more for your money. And if you want the current gen after the new ones come out, that'll be much much cheaper to buy...