Looks like not only will the next DirectX not have the "DirectX" name, it won't have backwards compatibility with 7, 8, or 9, either. Genius...

"The new DirectX will not be named Windows Graphic Foundation (WGF) as it was planned and will remain at the old name, as in DirectX 10. It will be released with their brand new operating system Vista. This news API will be composed of new and faster dynamic link libraries (DLLs) and will run much faster (so they say)."