Update (2010.05.13): NVIDIA has removed both demos because they were not finalized. The final versions will be released officially soon.
NVIDIA has published two Direct3D 11 tech-demos for the GeForce GTX 480 and GTX 470. Both demos (island and hair) are based on hardware tessellation, one the big feature of D3D11 / SM5 GPUs and have been shown during GTX 400 launch.
The first demo shows how to simulate and render realistic hair. You can download it HERE.
Oops! the nice brain…
The second demo, is the Island. This demo includes water with realistic and physically simulated waves. You can download it HERE.
Caustics rendering enabled
Caustics rendering disabled