I also want to add,
when the iPad launched back in April, I remember talking the employee at the front door (she was very excited about the launch, but also looked tired) so I asked her what time she had to arrive for the 9am opening, she replied "1am."
"A few of us had to come in really early to set up all the display units and poster graphics around the store, and we couldn't that last night after closing because we had to wait until exactly April 3rd to open all the NDA boxes."
People keep asking how many units XX store will have, but honestly most Apple employees don't even know this information, much less us people of forums.
I just wanted to share.