Currently, the Intel D975XBX (Bad Axe 1) rev. 304 boards out there can support the upcoming Conroe and even the quad-core Kentsfield since the board is based on VRD11 design guideline and both processors work fine with VRD11. As for thermal envelope, Conroe is 65W and Kentsfield is 95W.
VR-Zone
VR-Zone