I ordered my D4 on March 23 from a local bricks and mortar store after hearing some of the challenges with the larger retailers. I was 9th on the list now I am 2nd and still waiting patiently. (well not so patiently lol). The benefit is that I already have an extra battery and cover, RRS L bracket, XQD cards and reader, the manual down loaded on my iPad, the firmware updates already to be loaded to the body if they haven't been loaded by Nikon.
As I said patiently lol. I am sure it will be worth the wait.
Good luck to all those still,waiting! And the fortunate few that have theirs already.