With iPhone 4 I had to stay in line for about an hour and it was about 4 years ago, last week of august. I remember a shortage of iPhone 4 till fall.
With iPhone 5 and 5S it was different, so it will be this year.
I'm not going to spend a night outside a mall of course, but I'll wait a week after the release then go to an Apple store and maybe stay in line for a few minutes before getting my phone.
I don't like pre orders, I rather go to the AS, open the new device and power it on before leaving the mall. With iPhone 5 there were so many problems with scratches so I'm happy I checked my phone before leaving the store