The Inquired has a story posted today that talks about an upcoming chipset from AMD / ATI, codenamed RD690, that is supposedly Quad FX ready - it just wasn't ready in time for launch. You had to know this was in the works.
"AMD has an in house chipset that can support its "4x4" microprocessor. We suspected this for a long time but now we have it confirmed. AMD wanted to have its own chipset for its own 4x4 off road vehicle platformance but it could not make it on time. Nvidia was the easier and better choice as it had a solid as a rock chipset."