Thanks for the replies guys ...
Moreorless ... what you say seems to make sense but i can't understand why Canon reduced the MP in the 1DX as it was supposed to replace the 1Ds3 too. Still ... what Canon are up to these days seems a bit of a mystery to me.
I like a lot of MP as i blow my images up big and i'm experimenting with Gigapixel images too. The higher the native mp in the camera, the less i need to zoom and the higher the quality.
Shame these camera makers play their cards so close to their chests these days. I remember Nikon once saying "We have no plans to release a full frame body" when i had a D2X so i switched to Canon. More fool Nikon as they've lost a lot of trade.
As has been said I think the 1DX is really an update of the 1D line not the 1Ds line.
To me it seemed that besides the lack of video the problem the 1Ds mk3 had was that it seemed to be targetting two markets, half landscape/studio users who wanted better AF than the 5D mk2 and half sports/action users who wanted better image quality than the 1D4. By going for both they couldnt really please either entirely and ended up with a very expensive camera that included some features users didnt need(landscape users for example probabley didnt need the extra grip).
I'd guess the lesson Canon took from that(and the D3x) is to target each new pro level camera to a specific market believing that users will pay a prenium if they got the specs they were after and were not "wasting" money on ones that werent. So the 1DX offers a big improvement in ISO performance over the 1D and smaller improvements in FPS and resolution targetting sports/jurno's and the 5D mk3 got a big improvement in AF and smaller ones in FPS, ISO, Video and a more pro level body(100% VF, twin cards etc) targetting event photographers who may also be moving into videography.
How to target the high resolution market seems a bit more uncertainly to me, do they go for 30ish as Nikon have or push things all the way of 50ish(where I'd say Moire in an AA filterless camera maybe less of an issue)? do they need to offer pro level AF? decent FPS? etc?
Canon's weakness in DR is also I'd say much more of an issue with a high resolution camera, with the target markets of the 1DX and 5D3 is something that I'd guess doesnt concern most users greatly where as it does alot of landscape users and possible many studio users aswell that such a camera would target.