The new Nikon mirrorless camera is already out in the field and I have already received the first drawing from a person who has used/seen/tested the camera.
As you can see from the sketch, the back layout is similar to most Nikon DSLR cameras with the exception that there are no buttons/controls on the left side of the screen. The screen itself looks pretty big and there is also a comfortable/ergonomic thumbrest in the upper right corner.
Update – here is a visual of the back of the camera created by a reader (© oldfashioned_aj):
The previous drawing submitted by a reader was actually very accurate: