Well, i don't know as i don't own a DX10 card yet but i guess some of the cards are fast enough whilst others aren't. Beside of this the update is around the corner and it will go through the usual dev cycle they've established.
10 invent technology
20 optimize current tech
25 sometimes marketing wants another update
30 goto 10
10 invent technology
20 optimize current tech
25 sometimes marketing wants another update
30 goto 10