AMD Board has posted some info on the new AMD Socket 754 Sempron Desktop Stepping

A day after the mobile version, AMD announces a new E6 stepping for the desktop version of Sempron socket 754 starting July 30th. The E6 stepping is pin-to-pin compatible with the E3 revision and will request a BIOS update in order to allow the ID recognition of the chip which changes from 00020FC0h to 00020FC2h. AMDboard.com has the news with the new PIB OPN chart of all models at

New AMD Socket 754 Sempron Desktop Stepping