In this early stage, we've learned that even in the next generation Nvidia doesn’t plan to support DirectX 10.1 API.
Nvidia wants to continue its DirectX 10 path, and there's a good chance that it will simply migrate to DirectX 11 before it supports DirectX 10.1.
As Nvidia has a dominant position in game development and in the publishing community it doesn’t look that DirectX 10.1 has a lot of chances in 2008, but ATI will certainly push a title or a few that will have full support for DirectX 10.1.