Probably most if not all of them I would bet.
What better way to test your new language and hardware and drivers than by running your new company's library of renderings through your product.
Although, all we have seen is a screen shot of an image that was supposedly rendered using Cg on a Nv30. We think.
Oh, and it would be quite easy to break the NDA if you weren't carefull.
Just look how the supposed rendering of an image is generating web pages full of speculation and flame wars.