Continuous AF in video mode/live view patent (used in the upcoming Nikon D3100)
As some readers already noted, this previously covered patent application could be the base of the new continuous AF in video mode/live view feature which will first be implemented in the new Nikon D3100 DSLR camera. As you can see from the drawings, Nikon produced various camera configuration as a possible implementations of this patent, which could indicate that this solution will spread across all future Nikon cameras, including the EVIL system.
Nikon patent application 20100150539 is for a focus adjustment solution (see wikipedia’s explanation of the two different passive focus solutions: phase detection and contrast measurement). Different implementations are shown in this patent application: the first drawing is a camera with a half mirror, the second is mirrorless (EVIL) camera, the third implementations is without a prism (Pellix camera?) and in the last drawing the sensor is located under the mirror (instead of behind the mirror):
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