Kotaku just talked to Acclaim's David Perry, the guy who allegedly spilled the beans on the upcoming PSP 2 earlier today. And he's pretty sure about a launch date.
I spoke to a developer who is working on [the PSP 2] right now. I know this developer is already working on it, so that means they have a prototype. That would sound like a fall release to me.
Perry may be loosely projecting a date according to the bit of information he has, but it seems to us that whether it's specifically a fall or winter 2009 release that Sony is aiming for, the PSP 2 is likely being prepped for contention in the next holiday season.