My two cents:
Now that we have seen the D800..
The D4 should be perfect for me. My studio is seeing a huge increase in the demand for cinematography. The file size for stills is prefered, the 75mb NEF's from the D800 would be insane to manage in quanities we pull down at weddings. I need rock solid AF in the dark, clean hi-iso, and a meter that can handle highly dynamic shooting environments. Lastly the new wifi setup is killer.
That being said i have a D800E on order for my portriat, commercial, and video work, it will be the perfect companion for the D4.
Now on to the bad list....
Only USB 2, top iso is HI-4 (wtf), no built in GPS (mostly a D800 complaint), different card slots (im cool with XQD but just put in two slots).
And there you have it.