Update #3: On this image, the label clearly looks like a D3, on the next few frames it looks like a D4 (see other pictures below). Here is a hi-res version.
Update #2: I am not that far in the video yet, but a reader already took this screenshot from the 29:21 mark - hard to tell if this is D4 or D3:
Same image sharpened in PS:
Thanks Nick, Daniel and everybody else.
Update #1: here is the link to the video online (you will need to install Silverlight in order to watch it):
A dpreview reader writes:
"There was a documentary about the Australian photographer of architecture John Gollings who was working in the field with a Nikon D4. I only saw it for a short moment but there was clearly a 4 on it instead of a 3. The only significant thing I saw was the bigger top of the camera. I mean the prism on top of the camera."
Has anyone seen this?