At least a few partners will overclock the Geforce 8800 Ultra. They are not happy with 612 MHz as the final core clock, as they expected much more.
XFX and EVGA are not happy with this speed, and they are currently shipping overclocked Geforce 8800 GTX cards that work at 630 and 626 MHz respectively. You can expect some even faster iteration of Geforce 8800 Ultra cards, at least from these two.
The first reviews of default clocked cards are scheduled for tomorrow afternoon and these cards will work at 612 MHz / 2160 MHz and they will have faster memory speeds than overclocked 8800 GTX cards, but not faster GPU speeds.
Stay tuned for more information about the performance tomorrow.