I know there is lots of speculation, but this is my experience. I love to chat up sales guys in camera stores on slow days. I have been into a few lately and the story is always the same. The D800 sales continue to be ON FIRE as is interest in other Nikon cameras, low end especially.
Inventory of the D800 comes in and goes out just as fast, the pace hasn't really slackened yet.
5d Mk III? How many you want? Lots of stock. Why? Minimal interest and no pre-orders when it came out! Regular Canon people are coming in asking or buying D800's.
Sling your D800 over your shoulder and walk into any photo store and see how easily a conversation strikes up!
No one cares what the 5d Mk III images are like. Everyone wants to know how you are enjoying your D800.