If the 1Ds Mk4 is really being delayed, as more and more rumours are suggesting, what does this mean for the 5D Mk 3? The 5D Mk2 came out a year after the 1Ds Mk3; does this mean that the 5D Mk3 won't be released until 2012? Would Canon risk releasing a high resolution 5D line camera just a few months after a 1Ds line successor?
Are we going to start seeing divergence between the two product lines? The 1Ds Mk3 and 5D Mk2 had different processors (twin Digic 3s vs. single Digic 4), so with both lines presumably to use a new Digic 5 chip, would a 5D mk3 be able to maintain even a reasonable frame rate with half the 'horsepower', assuming the rumours that the 1Ds Mk4 will stay at 5 fps are correct (and that the reason for this is processing power -not necessarily a correct assumption, I know)? Even then, would 5 fps vs. 3.5 - 4 fps be enough of a differentiation for most potential buyers if the 5D Mk3's af system was upgraded to even 7D levels?
So, either the 1Ds Mk4 will be higher frame rate, have some new 'killer' features, will be cheaper relative to the 1Ds Mk3's price; or the 5D Mk3 will have a differnet sensor and target market. The problem with believing the latter, is that if Canon were to keep the 21 MP sensor and improve the AF and shooting speed, the 5D Mk3 would look very attractive compared to the 1D Mk4!
Just thinking out loud...