A new Youtube channel called 'Geeks3D' has uploaded a video which appears to be launch marketing material for the new NVIDIA GTX 680, the upcoming card believed to be based their new Kepler architechture and 28nm process.
Rather than discuss product specifications, pricing and launch dates, the video discusses in general terms the cards power efficiency and PhysX improvements. If not an orchestrated leak the vid may not last for long, so take a look.