@Crazzy: Not 1 week, the last 2 months. Besides, halfway through the year PS2 and PS3 were still almost even, so in only 15 weeks it got outsold by more than 1.5M consoles. That isn't a 1 week thing, that is a trend.
And about the price cut in Japan, read this:
http://www.gamespot.com/news/6180614.html