I don't take these scores seriously. There are so many inconsistencies and purely from a physics point of view I don't believe the DR of the D800. Compare for instance the DR and ISO scores of the 5DII and S100 - it makes absolutely no physical sense.
Totally what I expected though. 5DIII will come in just above the 5DII, DR no more than 12.5. In reality both will have a useable DR of about 7-8 stops.
Downloading raw files and processing them yourself is the only way to really get a handle on the differences, I certainly wouldn't base a buying decision of DxO scores.
In that case, do you believe the DR of the iQ180 (and other recent Phase One backs)?
Having seen them in action, I certainly do - you can push their shadows a long way to extract detail. You can push D7000 shots just as hard. Try doing the same with a 7D, 5D2 or even 1Ds3, and all you'll get is noise.