"VR-Zone has posted some info about the KYRO II Ultra and III chips. STMicroelectronics Kyro II Ultra chip aka STG4800 is still currently under developement and slated to release by this year end. Other than the clock speed, the specs of the STG4800 is the same as the normal KYRO II aka STG4500. The clock speed will be above 200Mhz instead of 200Mhz initially thought but how high above 200Mhz is still not confirmed yet.
For the KYRO III, the reason given for its delay is due to the development of KYRO II Ultra which takes more time than expected. The KYRO III chip will be ready by this year end but the fastest date to get the card out is Q1 2002."