There is the unofficial photo of the recently leaked PSP GO! handheld console.
Slated for an official release and announcement at the upcoming E3 event, here's the specs i've managed to dig up thus far.
* 3.8-inch display (resolution is undisclosed)
* 43 percent lighter than the PSP-3000
* 16GB of Flash storage
* Bluetooth built-in; supports handset tethering and BT headsets
* No UMD drive
* Memory Stick Micro slot
* New Gran Turismo, Little Big Planet and new Metal Gear Solid (!) on the way
* Full PlayStation Network support (movie and TV rentals / purchases)
* Integration with PlayStation 3 (works the same as the PSP-3000 does)
* Sony views each of its products as "10-year lifecycle products," so the PSP "needs to live on."
Hopefully we'll get more solid information and specs after E3.