I’m not sure how the rumor started (my guess is that someone on some forum just made the assumption), that the new XBOX 360 Premiums with HDMI output would be using the much-anticipated 65nm “Falcon” processor, but here is some proof that it doesn’t:
Courtesy of “wonderkins” from the NeoGAF forum comes this photo of his disassembled 360 Premium. Still a Zephyr 90nm processor. Ah, the lengths fanboys will go to, to get to the bottom of things ;)
He discovered that the new version does have improved heatsinks (with heatpipes!) so should be less prone to the Red Ring of Death.