Thats exactly close to what I think. New 5D MK III with less MPx and less noise - same sensor as 1D-X is most likely to come true. Well, I was at one Canon event last week and one guy asked Canon rep about 5D Mk III and he mentioned that there is possibility that a completly new line will be announced with different AF from current 5D Mk II and higher MPx sensor. I dont know the reliabilty of that info but it makes sense to me - especially when D800 with 36 MPx will be announced.
Now based on CR's last post on 5D3 MP levels, there is more reason to believe what I suggested is possible with the 1DX like sensor being featured in the 5D3 replacement. In speaking about 5D3 replacement, I mean a product that will target an "average" 5D2 customor who had bought 5d2 at about ~$3000 pricepoint give or take a few.
We are not talking about the highly vocal fans who say they don't mind paying $4500 or more for more features and MP. Such a body is not a "direct" replacement to 5D2 price point.
It may well be that Canon can easily make a 36+ MP sensor, upgrade electronics to increase data flow, engineer moderately higher ISO performace in a body. Perhaps we can wish in our wet dreams that it will shoot at blistering 12fps, upgraded AF, in a weather sealed body, that dances a jig when we whistle...such a body is likely to target a higher price point as previously noted by some good heads here.
Using 1DX -like sensor will save Canon R&D dollars. By using 1DX like sensor, Canon can quickly deliver a new FF body with lower features than 1DX for about~ $3000 or so. They have used similar sensors in higher/lower end bodies before ....no reason to believe they won't do it again.
But keep your chin up MP folks! Based on what Nikon does, a higher MP version may well follow, but at a higher price point or with limited features to maximize profits. Best!