We have unconfirmed reports that a few retailers in the US and Canada will be receiving their initial Canon EOS-1D X shipments this week.
We have reports they've shown up already in Montreal, Canada. I expect to get mine some time this week.
We can't confirm, but we've heard B&H Photo has told preorder customers that they expect a shipment this week. The July 4, 2012 holiday may disrupt some shipping though.
Preorder the Canon EOS-1D X at B&H | Adorama | Amazon