Sure there are big lines around the block for PSP launch, and likely for PS3 launch too. But the Japanese don't have quite as big a holiday season as the US, so wouldn't it make more sense to launch before Christmas in the US, and in the spring in Japan?
(thats assuming a fall launch in Japan, which is the case for PSP, but might not be for PS3)
(thats assuming a fall launch in Japan, which is the case for PSP, but might not be for PS3)