The wait is almost over...
B&H has enough Canon EF 11-24mm f/4L USM lenses in the warehouse to cover roughly half of the preorders and will be shipping imminently.
A second shipment will arrive early next week and will cover roughly the balance of the preorders.
This is a very highly anticipated lens. If it is on your wish list and you haven't preordered, now would be a good time to do so.