British Gaming Blog has uncovered a picture of the PSP camera attachment. Unfortunately, technical specifications have not yet been released.
It looks like the metal-encased camera will be 1.3 mega-pixels and include a built in microphone. It also looks like, judging by the image, that the thing will jut out in front and behind the portable. I could be wrong about that, it might be that this image is showing some sort of security or display attachment