The GeForce Go 7900 mobile GPU series will soon be available.
The two 7900 GPUs are fabbed at 90nm. The "flagship" 7900 GTX has a fill rate of 12bn pixels per second and can process 1bn vertices in the same timeframe. The 7900 GS, which is pitched at "slimmer performance notebooks", offers a 7.5bn pixels per second fill rate and a 656m vertices per second rate.
Both provide all the key features of other, lesser 7000-series mobile GPUs - Shader Model 3.0 support, PureVideo H.264 hardware acceleration, CineFX 4.0, Intellisample 4.0, PCI Express, GDDR 3 memory support etc. - but presumably with higher memory and core clock frequencies. Nvidia didn't provide numbers, but the two new chips' memory clocks are 600MHz and 500MHz, respectively, making for effective clock speeds of 1.2GHz and 1GHz.