Famitsu has relayed 3 Firmware features of the new PSP-3000. First of all, there is a setting for color space under the system settings part of the XMB. There is also an option for AUTOMATIC USB CONNECTION, in which the PSP switches to USB mode automatically when a USB device is connected, and lastly there is a noise reduction feature for video output.
To quote: The PSP-3000 has a setting for "Color Space" under the system settings section of the XMB. This can be switched between Wide and Normal. Wide exploits the full color depth of the revised hardware, while Normal returns you back to PSP-2000 level color.
The 3000 firmware has an option for Automatic USB Connection. When this is switched on, the PSP switches to USB mode automatically when a USB device is connected.
Finally, the 3000 firmware offers a noise reduction feature for video out. This is used to cut the noise when outputting the PSP's video signal to a television. More PlayStation 3 News...