The PSP2 is going to be very tricky for Sony. They need to price it competitively with the DSi so that it can enjoy sales, and they need to have a constant stream of exclusive content on the system, even if they're console ports, new games in those series.
And the original PSP had a good launch, but a six month drought followed, Sony needs to make sure that when this PSP launches, there is no drought of content.