At least during the first week of the game's release, there should be a noticeable spike in the 360's sales in Japan. If you didn't click the first image, there were a *lot* of people lined up in that one store to get the game. 360 has been selling between 3-7,000 units across Japan each week. If there are that many people in that one store, there could be a lot more than 7,000 units sold across Japan.

I don't think anyone thinks the momentum will continue for long, much less after a month. We'll see when the sales figures are released (Joystiq posts them on Fridays)