DX10.1 is more-so for developers than end users. It mainly just gives more control over the gpu to the developer via api(the games will have control over how much AA is applied to each edge, thus why the requirement for support for atleast 4xAA), and makes for more efficient multi-gpu control.
Thus far, there's nothing too major in DX10.1 to benefit the actual user. Also, there's presently nothing announced that will use DX10.1, but that's obviously likely to change at some point.
See above.
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