@felix9: That's pretty much true, though. DirectX's improvements since DX9 have had very little impact, and 99% of games made since Vista came out still primarily target DX9, even today. Of course, that's largely the fault of the Xbox. If the next Xbox supports DX11, I'm sure games will start targeting that instead.
And have there been any changes to any component other than D3D since DX9? I can't think of any.