Update: In a comment to this thread, Denisa Mrackova (portfolio) explains the origin of those images:
"Apologies to everyone for this misunderstanding. My creation of the image of (non-existent) Nikon D4 is a study for a product visualization on my portfolio. Personally, I am a Nikon fan and own Nikon D3s, so I tried to achieve visuals of Nikon's new camera based on what I knew and liked about their latest products. Unfortunately, just before finishing the image, I sent it to few of my colleagues to discuss possible improvements and few moments later, these images showed up online. I apologize to everyone for causing these fake news."
Here are some more pictures of this project - amazing job, the best one I've seen in the two years I am running this site (somebody should offer her a job):
Those Nikon D4 pictures came from the Nikon Rumors Forum. Thoughts?
Update: good idea, let's start a poll: