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I think this is David Klutho uberphotog from Sports Illustrated. He has what appears to be two Nikon D700 cameras "glued" together with a 24-70mm f/2.8G attached. I am guessing there is some custom eletronics to synchronize the exposure and focus between the two. The little black box on the camera on the right has a cable running in one side and out the other. It has a simple toggle switch and what appears to be a indicator light. He was taking shots into the crowd.
Looks like he has done this before. Check out this book.
Seen in Explore!
Highest position: 56 on Monday, March 1, 2010
Also various mentions elsewhere.