I doubt it considering that the PS3 is involved.
The farther apart the graphic engines the harder it is to develop content for both of them simultaneously.
Something tells me that Microsoft wouldn't like the fact that there is a game that uses their proprietary DX10 "Games for Windows" platform that is also available on a non-hardware driven platform (PS3) that doesnt use it. "Games for windows" was specifically designed to make Vista a closed platform for games.
2010 isnt that far away either and although some of the newer cards could handle DX10 requirements without a problem, it would be a lot to ask a large Japanese consumer base to upgrade their machines to max just to play.
Another aspect to consider is that DX10 is ONLY available on Vista as of current. DX11 is Windows 7 which will be released later this year.
The latest versions of Direct3D, namely, Direct3D 10 and Direct3D 9Ex, are only officially available for Windows Vista, because each of these new versions was built to depend upon the new Windows Display Driver Model that was introduced for Windows Vista. The new Vista/WDDM graphics architecture includes a new video memory manager that supports virtualizing graphics hardware to multiple applications and services such as the Desktop Window Manager.
That API described above is not open source and I have never heard of it being licensed to another but offical Games for Windows developers. Edited, Jun 3rd 2009 12:18am by patient