A new PSP motherboard was supposedly spotted by PSP homebrew scene coolies at Maxconsole. It's named TA-85, is for the PSP Slim and Lite, and dosen't allow access to the eeprom, which means you can't make Pandora batteries with them. However, you can used Pandoras on them.
Source:[
QJ.NET - QuickJump Home - PlayStation Portable News - PSP Updates]