In their just published review of the Nikon D600, dpreview did mention the sensor residue issue that was reported also by many [NR] readers:
Nikon is currently working on new firmware updates for the D600 and D800 cameras. The D600 update will contain a fix for the Live View aperture bug (currently you cannot change the aperture in Live View during video). The D800 update will fix the focus priority bug (with AF-ON in Live View changing the aperture causes the screen to [...]
Lensrentals noticed that all of their D600 rental units needed sensor cleaning after being used. What is even more interesting is that all spots seems to be located around the same area – the upper left portion of the sensor: Lensrentals did some additional investigation and found that “D600′s shutter curtain opening seems a bit [...]
Since Nikon introduced their new pricing policy in October 2011, it is really hard to find any good deals on Nikon gear since all retailers are now forced to sell equipment at the same price point. One exception from the rule is that stores can offer bundles valued up to 10% of the price of the product [...]
The Nikon instant rebates for October were extended and now include also the Nikkor 28-300mm lens and SB-700 and SB-910 flash units. For example, the Nikon D600 has the following available rebates: $200 off Nikkor 70-200mm f/2.8G ED VR II $150 off Nikkor 28-300mm f/3.5-5.6G ED VR $200 off Nikkor 24-70mm f/2.8G ED $100 off Nikkor 24-85mm [...]
I had the chance to play with the Nikon D600 for few hours. Here are some high ISO comparisons between the D600 and the D800E: Obviously at 916px wide, there is no visible difference between the D800E and D600 samples taken at ISO 25,600. Even at 100% crops it is still hard to see any differences: