Nasim Mansurov posted a new article on his blog regarding the mythical Nikon D400 camera. According to his source, who initially predicted the D400 announcement last year, the camera is supposed to be out around September this year:
"Apparently, the Nikon D400 has been pushed back at least twice now for several reasons. First, Nikon had some serious trouble with the supply chain when the floods devastated its Thailand plants. Most of the DX equipment was manufactured there (and many parts for the DX cameras and lenses were supplied by smaller companies in Thailand, which were severely impacted as well), so Nikon had to quickly move high-demand items off to other plants.
Nikon was on schedule for an early D400 announcement in 2012/2013 time frame, but it pulled the plug and decided to focus on the D7100 instead (and the current focus is to push as many D7100 sales as possible). It turns out that the camera went through several iterations and the earlier features did not fly with the upper management of the company."
As of today, I have not received a single reliable piece of information indicating that the D400 even exists. In my 2013 predictions, I mentioned that the 7000 and D300 product lines could merge. After the D7100 announcement we have been getting conflicting reports from Nikon in terms of the future of the high-end DX camera line.