ops sorry, my mistake, it's a long time i dont use that camera; just wanted to say that 12mpix more than 24mpix will not justify the double of the price, so the sales of d800 would be killed.
anyway i think that d600 will have a lot of features scaled down from d800
btw we are getting too serious about those rumors...this topic is a joke plain and simple
I look at it this way: Nikon made a blatant mistake with the D3x ... 24 Megapixels, FF sensor ... but way too expensive. Result: the D3x did not sell at all. Nikon realized what the problem was and released the D800 ... 36 fantastic Megapixels combined with virtuellay every other hi-end feature of the D3x [AF, metering, etc.] ... at HALF THE PRICE. This is why the D800 is such a game-changer. It establishes a totally new price-structure for higher-end DSLRs. A D600 with 24MP, slightly scaled-back features and a price of USD/€ 1500-1700 will nicely complement it.
Old structure, "pre-2012/D800"
* Canon and Nikon "flagship big megapixel DSLR with all the trimmings, except speed" (D3x, 1Ds3): USD/€ 6,000
* Canon/Nikon - speed flagship DSLR with max. speed, but less resolution (D3/s, 1D IV) - USD/$ 4,000
* Canon/Nikon "second tier, massively downscaled FF-DSLR" (5D1+2, D700): USD/€ 2,500
* Nikon D4/Canon 1D X - flagship specialist journalism/sports camera, max speed, limited resolution - USD/€ 6,000
* Nikon D800 - max. resolution, fully featured, except speed: USD/€ 2,900
* Nikon D600 - second-tier FF-model, less resolutuon, features scaled back: USD/€ 1,500-1,700
Canon has failed to adequately repond to this and will undoubtedly pay the price in market share. While the 5D3 is definitely a good camera, it is nothing more than what the 5D2 should have been from the very start. As so often with Canon: too little, too late, too expensive. In order to really win big time, it would have needed a killer new sensor [24 MP would have been enough, but with massively mproved DR and Hi-ISO noise] and a killer feature helping users to more keeper shots more easily - e.g. fully working, 2012 implementation of Eye Control Focus - in order to justify a higher price and effectively compete with the D800.
And yes, initial 5D3 sales may be good, as impatient people are skimmed off their excess purchasing power (no problem with that). And yes, Pro's may not switch immediately due to large system investment.
But MANY "FF-upgraders"/enthusiasts/semi-pro's will quite easily switch from Canon to Nikon. Especially since they need to sell their EF-S lenses anyway since these are unusable on Canon FF DSLRs. Even more so, if/when Nikon comes out with a 24 MP, "well-enough featured" D600 @ USD/€ 1500-1700. There are many more people (amateurs) able and willing to spend that amount of money rather than 3 grand or more for a camera. The D600 will therefore nicely complement the D800 ... difference in price, resolution and features will be nicely balanced. :-)