The highest selling Ps3 game LTD in Japan so far is MGS4 at only 680,000!
I never realized how low the amount was in Japan.
But with that said, Final Fantasy XIII is exclusive to Ps3 in Japan. The first FF games every gen typically sell around 3 million copies in Japan. If FF does sell it's usual 2.5-3.0 million copies in Japan, that will be 4-5 times more than the second best selling Ps3 game in Japan.
We know the fanbase in Japan for FF is huge. Even the DEMO for FFXIII caused a spike in Ps3 sales. How many copies will FFXIII sell in Japan? How much of a spike will it cause in Ps3 hardware sold in Japan?