Doors opened promptly at 5:00, and the first batch of customers were welcomed in to the store to thunderous applause (I've seen this on videos, but I thought it was just a Cupertino or NY flagship store thing). I was about four people behind the first batch in, so I ended up getting in and out in 15 minutes.
When I left, the line stretched all the way back to the ice skating pavilion and around the corner to Panera. If I had to guess, easily north of 250 people.
Here's an interesting tidbit: just before the doors opened, one member of the security team started barking at people to put their cameras and cellphones away. He was even chasing down pedestrians on the other side of the street. Not sure what that B.S. was about, but as a photographer, I take exception to that sort of overreach. It's a public street, and last time I checked, the Apple store is not a post office, military base, or other government facility.