I think we need to wait and see. I'm not sure that hardware specs need be that high to run Vista in a similar fallback to XP. It's only if you want all the eye candy and 3D desktop with shaders that you need a fancy video card.
It is recommended to wait for a DX10 video card if you want to play the next gen of windows games. In some cases DX10 is claimed to be up to 6x faster than current DX9 tech.
It is recommended to wait for a DX10 video card if you want to play the next gen of windows games. In some cases DX10 is claimed to be up to 6x faster than current DX9 tech.