If the guys at ExpReview are correct, then Intel's X58 chipset, with an ICH10 southbridge, will be the first chipset to support Nehalem. They'e got a roadmap posted, along with a photo of a board they believe to be X58-based.

"he biggest point of the board will be the odd lay out, dual channel, Triple channel DD3 supporting and Dual PCIe 2.0 X16 or Quad PCIe 2.0 X8."