Coming in July…. sort of
Canon Canada has started to confirm the preorder lists from retailers for the EOS-1D X. Retailers have to prove the people buying the camera are CPS members, and have prepaid for the camera. If the camera is needed for the Olympics, it appears you're moved to the front of the line. I don't know if any other countries are going to experience the same limitations with the initial shipment of cameras.
Canon Canada expects a very small number of cameras in July, and that should be the same across the globe.
It still looks like August, and more likely September, is when we'll see larger quantities of the 1D X.