Now, I don't even care about DirectX 10.1 which only has minor update for DirectX 10. DirectX 11 Games will come in at least Q3 2009 and many game developers will jump directly to DX 11 and use new features like tessellation, etc (according to the future roadmap of ATI, NVIDIA). Unlike DX 9, DX 10 would not last very long. DirectX 10, DX 10.1 will become obsolete pretty soon when the DirectX 11 comes out in Q1/Q2 2009.
Anyway, I still don't wanna miss the DirectX 11 party by 2009 and this is why it is convenient for me to wait and future proof myself.