Sony Next Gen Portable

New handheld to feature OLED touchscreen, 3G, two cameras; slightly smaller than PSP-3000.

Codenamed the Next Generation Portable (NGP), the new handheld is set to release in "holiday 2011", and will include features such as 3G, Wi-Fi, a rear touchpad, OLED screen, and more.

The NGP will feature a 16:9 5-inch OLED touch screen, as well as a touch pad on the rear of the device which is the same size as the front screen. At 182mm x 18.6mm x 83.5mm (width x height x depth), the NGP is slighly smaller than the PSP-3000, but there was no detail released on how heavy the new handheld would be.
Gamers who lamented the lack of a second analog stick on the original PSP will be heartened to know that the NGP does indeed sport twin sticks, as well as Sixaxis motion sensing built into the device. Other notable features include two cameras (front and rear), built-in GPS, 3G, Wi-Fi, and Bluetooth connectivity, and more.

The full specs list for the NGP : 

CPU: ARM Cortex-A9 core (4 core)
GPU: SGX543MP4+
Dimensions: Approx. 182.0 x 18.6 x 83.5mm (width x height x depth) (tentative, excludes largest projection)
Screen: Touch screen 5 inches (16:9), 960 x 544, Approx. 16 million colors, OLED, Multi touch screen (capacitive type)
Rear touch pad: Multi touch pad (capacitive type)
Cameras: Front camera, Rear camera
Sound: Built-in stereo speakers, Built-in microphone
Sensors: Six-axis motion sensing system (three-axis gyroscope, three-axis accelerometer), Three-axis electronic compass
Location: Built-in GPS, Wi-Fi location service support
Keys/Switches: PS button, Power button, Directional buttons (Up/Down/Right/Left), Action buttons (Triangle, Circle, Cross, Square), Shoulder buttons (Right/Left), Right stick, Left stick, START button, SELECT button, Volume buttons
Wireless communications: Mobile network connectivity (3G), IEEE 802.11b/g/n (n = 1x1)(Wi-Fi) (Infrastructure mode/Ad-hoc mode), Bluetooth 2.1+EDR (A2DP/AVRCP/HSP)

more info from GameSpot