These slides on NVIDIA’s website are from a presentation on terrain tessel(l)ation.
It’s hard for me to glean a lot of information from the slides without the accompanying presentation. As far as I know, only ATI has an extension for Direct3D 9 and 10 that exposes a hardware tessellator. The tesselator is being added to Direct3D 11. Does NVIDIA have support for hardware tessellation? Is support ever going to be added to OpenGL?