The dies are based on the same architecture, but each has different features added. It is not a "grounds up" design, they are based on the same thing. But you can't put an istanbul in an AM3 and call it thuban because there are different features.

As to whether someone has an actual bulldozer running, let me just propose this thought: The guy who would know a.) there were silicon available and b.) if any of that silicon was outside of our walls, is saying that someone can't have silicon in their hands.

I obviously can't comment on specifics, but, if someone was wondering whether there was actually silicon outside of AMD's walls, they might want to put slightly more faith on the person who has access to the master schedules, no?

Everyone can believe whatever they want. It's not the laws of intellectual property that are at debate here, it's the laws of time and physics.