Upload & Sell: On
As a dual system shooter I would like either canon or nikon to release a 7Dll or a D400. I don't think Canon will do it because a 10 FPS 7Dll would almost for sure cannibalize 1DX sales the same way a D400 would eat sales from a D4, I think Canon and Nikon made a mistake in how they designed their camera models.
Canon was right on track when they released the original 5D and would have completely taken a significant amount of Nikon users if they had decided to put a more advanced autofocus system on the 5Dll, Nikon realized that and decided they would challenge Canon in the megapixel front and with the amazing Sony sensor they put in the D800, for the first time in the digital age they are ahead of Canon in that department (I don't count the D3X in this because I'm comparing prosumer bodies)
To me it would make more sense if they hay two lines of prosumer bodies and one flagship camera:
Canon 5Dlll, NikonD800 as they are
7Dll, D400; a sports crop body, with less megapixels for cleaner noise and fast writing
speed and buffer and 8+ FPS
1DXll and D5; a true combination of both 1D lines, a high megapixel, high FPS machine with a Sony sensor
But I understand that both companies are in this to make money, and so they do what they think will make them more money. And that is the only reason why I think we won't see a D400 or 7Dll.