Nikon announced a slate of 100th-anniversary commemorative gear back in April, including a metallic gray version of its flagship D5. Then, in June, Canon unleashed details of its 6D Mark II. Today, both companies have reported that their latest DSLRs will be delayed reaching the hands of eager customers.
Canon released a statement saying that shipment of the Canon 6D Mark II kit with the EF 24-70mm F4L lens—which was intended to ship on August 4—has been delayed until an unspecified date due to an excessive number of orders (which, honestly, has us raising our eyebrows given all the early complaints about the unit from filmmakers). However, if you don't want to wait for that particular combination, you can currently get your hands on the 6D Mark II body only, or with the 24-105mm f/3.5-5.6 and f/4 lenses.
Meanwhile, Nikon has stated that shipment of its 100th-anniversary D5 will be delayed from July 28th to early next month as the company makes "final adjustments." You'll have to be satisfied with the commemorative-stamp-free version until Nikon announces the updated release date.