Concerning your reverts on WDDM 

The Microsoft MSDN article clearly states "Windows 8.1 Preview introduces version 1.3 of the Windows Display Driver Model (WDDM)" and "The following functionality has been added in Direct3D 11.2, which is included with Windows 8.1 Preview, Windows RT 8.1 Preview, and Windows Server 2012 R2 Preview." along with all the features that I supposedly 'claimed'. WDDM1.3 is in fact used in Windows 8.1 Preview, you can verify it by yourself.