Armed with this knowledge, we went and asked ATi about it, since they're probably in the best position to know whether or not the new API is actually implemented. Here's what they had to say:
"Ubisoft are at the forefront of technology adoption, as showcased with the fantastic Assassin’s Creed title. In this instance our developer relations team worked directly with the developer and found an area of code that could be executed more optimally under DX10.1 operation, thus benefiting the ATI Radeon HD 3000 Series."
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