The PSP2 will have a high-resolution, touch-sensitive screen, dual analog sticks, front and back-facing cameras, tilt-sensitive SIXAXIS controls and a touch sensitive back panel. It will also have both Wi-Fi and 3G connectivity.
By the way, it's getting renamed to Next Generation Portable or NGP for short.
At the same event, Sony also announced that several PlayStation games will be coming to Android phones.
Source: Kotaku and Gizmodo.