An anonymous post at a gaming blog showcased what looks to be the new PSP Go and a survey of some sort (that mainly asks about a game rental service for the PSP) that might hint at the new features.
Sony still hasn't officially confirmed this news, (they will probably wait until the E3 Show) but it looks to be that Sony will in fact release this new PSP some time later this year.
The survey also commented on the promise to have a large amount of game content available at the launch of the new device.