Ok , Well my first impression of the D4. I transitioned from a D300 > D3 > D4. So the transition from the 3 > 4 was so far easy. The video section was new to me but so far it is fairly simple. I did not get it for the video. The camera shoot like the D3 and the menu screen are similar in structure. I went from the box to shooting a job the next day with out any glitches.
The Hi ISO did impress me. I set it at 3200 in camera noise reduction off, As per a Nikonian recommendation. It impresses me. It is like going from my d300 to my d3 then to the d4. Every upgrade was more than I expected.
I was on BH list thinking all shops were having a backlog on D4 until I started looking around. I call Jacks Camera in Muncie, In and they had two! I cancelled BH order and had my D4 the next day. Try Jacks ask for Tom. No I do not work for Jacks! www.jackscamera.com . Good luck on your D4. You will not regret it.