World's smallest 4K USB 3.0 camera delivers 21 frames per second, fits in pocketsBy Mat Smith posted Jun 29th 2012 at 11:32AM

After proving that a 1080p webcam on USB 3.0 was possible, to the surprise of none, Point Grey's latest addition is a little more impressive, This "ice-cube sized" camera can pipe 4,096 x 2,160 images through that capacious USB 3.0 port, using Sony's new IMX1221 Exmor R sensor. Thanks to its size, the camera is geared toward business-centric applications, including broadcasting and high-resolution optical inspection -- which goes some way to explaining the $945 retail price.
http://www.engadget.com/2012/06/29/worlds-smallest-4k-usb-3-0-camera/