Noticed this and knew that there were a number of people who either have or are going to import a PSP from Japan. The new BIOS version is 1.50 the same as the North American PSPs. For more information, check out the link:
http://psp.ign.com/articles/598/598454p1.html
-DD
Mods - Feel free to move this thread if it isn't in the right place.
edit: it wasn't. i felt free