Nikon filed a bunch of patents at the end of 2008 – here is the patent search result of Nikon + lens. Please note that most of those are just patent applications and may or may not lead to a final production model.
“Heretofore, lens-interchangeable type cameras provided with a barrier that, in a state in which an interchangeable lens is not attached, closes off an aperture that is provided in a casing for allowing the passage of object light has been known.”
“It’s a patent for having auto focus pixels on a sensor. They have suggested that we can have some rows on the sensor of a camera dedicated to auto-focus. The pixel rows on either side of the auto focus pixels will have slightly different sensitivities to make up for the ‘lost’ row of data.”