PSP Go was leaked  in a program of PSN, the specification is below:

built in 16GB memory、without UMD、3.8″ screen、support bluetooth ，43% weighter than last version ，Memory Stick Micro slot.

John Koller in SCEA said PSP Go is not used to take place of psp 3000, it’s complementation of psp. more information will be published in next E3.

[from sina]