I have to agree with neuroanatomist, I don't buy the Tsunami reasoning. I don't know if Canon will launch a 1Ds Mk5 this year and I'm pretty sure that they will launch it before a 5D Mk3, otherwise any resolution hungry pro may just settle for the latter. Far more likely reasons to delay a launch are the economy and the lack of any next generation competition from Nikon and Sony.
As for the 5D Mk3, it needs better AF, it must really make 5D Mk2 owners' blood boil that their camera's AF system is inferior to the 40D's -a lower end model and a year older to boot. The D800 will undoubtably have Nikon's top-of-the-line AF (be that the current 51 point system or an improved version) and Sony's A900/A850 replacement will probably feature the new 19 point system from the A77. To remain competitive, the 5D Mk2 must have at least the 19 point system from the 7D, anything less would be an insult to potential buyers (and don't give me this rubbish about the 5D series being a 'landscape' camera -in my view that's an indictment, not a raison d'etre). Really, Canon should be moving to match (sorry, catch) Nikon and standardise on the 45 point AF system across all of the single digit series. That would also enable them to move the 19 point AF system down to the XXD range, where the 9 point system is looking obsolescent against the competition.
We Canon users are becoming too used to making excuses for our brand, we have come to expect so little of Canon that we rejoice at any small mercy. So let's have no more of this "as long as the 5D Mk3 has 9 cross type AF points I'll be happy", you deserve more from a camera that's going to cost well over $3000.