Pre-ordered 5D3 w/24-105 kit from Amazon on March 2nd at 9:30AM PDT. As of today (3/18) shipping estimate is Monday, April 2nd, with delivery to California between 6-9 April. All looks well.
While waiting I downloaded a copy of the 5D3 manual and am busy reading away. I'm finding there to be a lot of similarities between the 5D3 and my 7D, which is not too surprising. Should help my learning curve.