It seems like most of nVidia's chipsets have typically been awfully power hungry relative to their competitors for several years now, especially at the high end so I can't imagine chipset level power usage is a particularly large concern at this point for them or that they'd be too desiring to speak in much depth on the subject.

Nvidia also plans to launch its MCP73 chipset—its first integrated graphics chipset for Intel processors
As long as you forget about the original XBox platform, which was the foundation for the nForce line.

Someone should ask them what their take on the power consumption and heat output of chipsets is. Seems like chipsets nowadays are starting to crank out insane amounts of heat requiring ever more cooling to compensate, while CPUs on the other hand are getting cooler.