I guess it's Canon sussing out the perception of the competition, but it might give some idea as to the future of the 5D. Make of it what you will.
My sense is that people always want more of everything. More features, better quality, greater durability, better sealing, faster speeds, etc. Improving anything requires greater investment by a manufacturer — in employees, research, development, materials, testing, manufacturing, quality controls, etc. — and of course charging accordingly. But when a manufacturer introduces the improvements that people said they wanted, there is inevitably much complaining — even outrage — about the price. "How dare they raise the price!?" It's as if we forget that all of the extra things we ask for actually cost money.
The 5DIII is the perfect example of this. Canon improved and upgraded just about every detail of the 5DII, as per many photographers' requests. Then there was no end to complaints about the price.
Following this logic, if Canon (hopefully) continues to make improvements to their DSLRs then in a few years it will be perfectly fine to charge $10K for the next 5D body. Yeah, we get improvements on top of improvements and it is perfectly fine to price them up - new price on top of the old one. I am sure there will still be people with enough cash and professionals who can pay for this cam after one shoot. Great strategy.
To Chuck: I see a reasonable price as a price which can survive for a fair amount of time (like close to a year) and still sell the product without a massive outcry regarding the price and without all the crazy price fluctuations just months after the release. I suppose a $750 discount by an authorized dealer moving over 800 units in just a couple of days does tell us something about the price here. I am not saying Canon needs to follow Nikon in everything, but if you think 5DMKIII exists in a separate universe from D800 (marketwise, at least) then we are probably speaking two different languages. I agree this price topic is already beaten to death and my initial remark on the topic was done mostly as a joke, but hey, what else is as exciting as Canon's prices lately =))
Take it easy guys ;-)