Indeed these are interesting times, but they are also turbulent times, new tech is coming fast and furious, what we call a camera is being pulled in many directions, from cell phones, to HD video cameras the size of a deck of playing cards, slt, mirrorless, HDSLR, planing your multi-year market strategy during these times must be scary, you could literally kill your company(or at least the division) if you bet wrong.
Canon is facing pressure like it hasn't felt in a while in designing the replacements for the 5DMKII & 1DsMKIII,
I have a feeling that Canon was cough off guard at how popular video was in the 5DII, I would be surprised if the 5D & 1Ds R&D budget's haven't doubled or at least been increased, the competition over this next product cycle is going to be fierce,
Nikon is bringing the D4 & D800, Sony with FF SLT, RED, Sony Emount video system, Panasonic has theirs.
I could see the 5DMKIII with 2 bodies as that's relatively cheap compared to the guts inside, so one will be like the 5DMKII, with improved ergonomics, and another that's, well uglier, but it will be modular, so you can attach things to, like lighting, mikes, lcd's and grips to name a few, call it the 5DVMKIII, I
I'm sure the D3(s)/D700/SLT situation has caused Canon to rethink their strategy for those markets, which could result in a delay.