NVIDIA is getting ready to introduce the G92 on November 12, 2007. It's said that this 65nm GPU will support the new PCI Express 2.0 bus and that it will a a mainstream part and not a chip that will replace the GeForce 8800 Ultra.
X-bit Labs isn't sure but writes NVIDIA might be considering to create another GX2 graphics card:
Besides creating a chip that would feature over a billion of transistors, Nvidia may chose an option to produce a dual-chip graphics card based on relatively inexpensive graphics processors. Unfortunately, there is no reliable information whether Nvidia’s G92 is actually a complex high-end graphics processor, or a chip of modest complexity to replace Nvidia GeForce 8800 GTS and power a dual-GPU “GX2” graphics card.