Ubisoft said in an interview with PCGH that there are no plans at the moment to re-integrate the infamous DX10.1 support.
You might remember the whole discussion: Assassin's Creed was the first game that shipped with DX10.1 support (Radeon only, as Geforce cards currently stick to DX 10.0). And Ubisoft patched this support away so that Radeon cards got slower under Vista SP1.