BHC

Nikonrumors now has a link to a page with some full-res samples at high ISO (800-25400). Based on these limited data, I would say that the performance in DX crop mode will not be competitive with the D7000.

I wonder about the utility of FX for underwater shooting. For macro, I use the Tamron 90 or Nikon 105 on a DX body. So to get the same composition in FX, one would need to either use a 150 mm or longer lens, or get 33% closer to the fish. Either way, the whole business becomes more challenging.