CURRENTLY there is no DirectX 10 capable hardware , they have been scheduled late in 2006 but, for the moment, they still in work process.
This means that all the fresh presentations of future plays DX10 are made on the hardware running of DirectX 9.
The direct x software developper can emulate just about anything on the existing hardware, thus you can show and check your future plays such as Far Cry Crisis on existing technology GX2 of X1900 XTX or Geforce 7950.
Naturally, the direct X 10 will function much more faster on the dx 10 based hardware of DirectX 10