I have a hunch they kept the 5D3 price so high initially because they wanted to keep selling the 5D2. Remember the D700 was discontinued upon D800 arrival. This kept the 5D2 selling well due to the huge price gap.
So I'm going to assume the 5D2 will be discontinued very shortly and a new lower price model will be introduced. Canon was the first to sell a digital DSLR below 1k, now the can have the first FF below 2k!
Note: None of these statements have been researched or fact checked, so I reserve the right to be wildly off base on all claims.
I got my 5D2 for less than 1500- good prices come to those who don't pre-order! Stay a generation behind and you'll never have buyer's remorse