that's just silly. the audience for such camera is not those that care about crappy high ISO images done under crappy light with crappy dynamic range that is associated with high ISO values. the audience for this camera are light lovers. people that shoot in studio or landscape with buckets of beautiful light and not the inside of their closets with the lights off. I'd much rather see LOWER ISO capabilites. how about ISO25 for a change and 14+ stops of DR. The D800 already proved that downsampling big MP to 22MP more than matches what the 5DmkIII can do in low light, so who cares for more? If so, don't buy it. Stupid high ISO can be hand with the 1DX if that's your boat. I see no reason that every camera has to chase the ISO values as if that was the only priority.
http://mansurovs.com/nikon-d800-review#iso_performance
(click next at the bottom to see the D800 match the 5DmkIII at high ISO)
The religion of low light is honestly getting old. We need to move past that. this is after all PHOTOGRAPHY, not DARKography.