Hasn't the G90 been out already? Since we're using the G92 chips now, but I do know is the all new Nvidia G100 (NV60)!!!!!
Unlike G90 that is based on the same architecture as the G80 aka NV50, the nVIDIA G100 (NV60) will be a totally new architecture and support Shader Model 5.0. The nVIDIA G100 will be based on TSMC 45nm process and will amount to more than 1.5 billion transistors. The Nvidia G100 will support the Nvidia CUDA 2 technology and will have much more computational power than the NV50 (aka G80/G90) architecture. The marketing name for the G100 is said to be "GeForce X1800 GTX". G100 will have almost 2 Teraflops of shader processing power.
The G100 is to be released in Q4 2008 or Q1 2009 timeframes.
*Fact: Microsoft Window's Blue Screen of Death vs Computerforums.org's White Screen of Death. Which is worse?