Copied directly from his blog :
Here is a quick summary of what KB 2670838 adds to Windows 7 Service Pack 1 / Windows Server 2008 R2 Service Pack 1:
⦁ ID3D11Device1, ID2D1Factory1, IDWriteFactory1, IDXGIFactory2, IWICImagingFactory2, ID3DUserDefinedAnnotation and related APIs are available. Methods that depend on WDDM 1.2 drivers or new Windows Store app APIs are not supported.
⦁ Improved Direct3D 11 device interoperability via ID3DDeviceContextState, including the improved interop with Direct2D/DirectWrite
D3D11_FEATURE_DATA_D3D9_OPTIONS feature detection
⦁ In addition to the new Windows 8 WIC features, this update also fixes decoding of 96bpp floating-point TIFF images.
All other features of DirectX 11.1 are Windows 8 / Windows Server 2012 only.
And there is more information here : http://support.micro...8?wa=wsignin1.0
The update is currently at Pre-Release : http://www.microsoft...s.aspx?id=35661
Edited by Gavin Williams, 20 November 2012 - 08:58 AM.