Bob Krist wrote on his blog:
"I’m shooting another one of those jobs that I can’t share with you (until the client uses the pictures) and it’s a gig that I can’t even show you the gear I’m using (that’s proprietary too)."
The interesting part is that there is a photo of him taking pictures through the window of a helicopter over Miami. You can see portion of the camera, but it is tough to get any details besides probably that it is full frame (based on the prism size). Check also the lens. This could be it!
Photoshop experts, Start! Your! Engines!
Bob Krist is the guy who did the A Hands-on Guide to Creative Lighting DVD for Nikon, so he is definitely in the circle of trust.
See also the related discussion on dpreview.