The Nikon D600 is currently shipping in many countries around the world. The camera seems to be very weel stocked and I don’t think there will be any delays when filling existing pre-orders.
Additional D600 coverage
Nikon D600 vs. D700 ISO comparison:
There are two tests: first is with NR OFF and second is with NR ON NORMAL settings. Photos are JPG straight from the camera with WB PRESET MANUAL and picture control set to SD standard. Same settings and lens were used on both cameras.
New Nikon D600 hands-on video: