It's highly unclear whether this is trying to implement DX10 in software (as it seems, thus not taking advantage of DX10 graphics cards and so essentially useless) or whether it will actually work like DX9 but support DX10. If the latter it would be great, but it's still a "preview" and I have doubts it will really make it in the end. Even if it does MS may shut it down. :p
- Oshyan