1Ds Mark IV before 5D Mark III?
We're told August will be a major announcement month. The 1Ds Mark III replacement and 3 lenses will be announced. No detail into what lenses.
5D Mark III to follow soon after according to a few folks.
It probably won't be until July when we started getting solid stuff with specs and a clearer picture of what's coming down the immediate pipeline.
Not until well into 2012 at the earliest. You can buy it, it's a great camera.