Nikon is continually registering new mirrorless camera patents. The lates patent shows clearly how the EVIL camera could look like. And those are the patent details:

* Patent Publication No.2010-161569
o published 2010/07/22
o filled 2009/01/07
* Problems
o At the time of lens desorption, useless thing invades the camera inside.
* Conventional technology and problems
o It make a protective cover.
o A lens end may come in contact with the protective cover.
* A patent of Nikon
o A Imaging Box
+ Sealing up space
+ It is formed by protective cover and OLPF, image sensor.
+ Rubber and resin are used for a connection of protective cover and imaging box.
+ Rubber and the resin are form of ring.
o It possesses a sensor detecting lens desorption.
o At the time of lens desorption, protective cover is pushed inside.
* The embodiment of the patent
o EVF
o It does not have a mechanical shutter(only use an electronic shutter).

Source: Nikonrumors