It is said that NVIDIA will launch its Nforce 4 chipset for Intel at the upcoming IDF, which starts on Tuesday.
This will be a high end chipset only, and will work in two possible configurations. It will work as a SLI where it will have two PCIe 8X ports working together, but it will be possible to make a board with just one 16X PCIe port. I believe that most will chose a SLI version of the board.
The Nforce for the Intel platform will support the Pentium 4 Socket 775 with a 800MHz or 1066MHz FSB.