Pureoverclock.com has posted a conclusion to the "Power of 3" campaign from Nvidia.

I have been told that "Power of 3" is not a reference to any new cards from Nvidia or some new form of SLI. Power of 3 is likely referring to SLI, HDR and Shader Model 3.0, all feature ATI currently do not have in there line up

Nvidia: The Power of 3, or Marketing