Depends on the store location I guess. I don't know about the 5s launch but during the 5 launch the queue at the Bull Ring apple store in Birmingham was over 30 people with 40 odd hours to go, which was quite insane to see really, although being -indoors- makes sleeping overnight for a few days not quite so bad.
-edit-
Ordered a 16gb silver six plus on three, only 2gb data but I'm lucky enough to have wifi at home, work and all the family's places so shouldn't be too bad. I've never put the phone on wifi before and was using 4gb a month roughly so should get it right down by hopping onto everyones network

Only need 16gb, would rather pay apple some ££ per month for more iCloud storage since I can add all my photo's from my DSLR collection into iPhoto and have them accessible on my phone/tablet too.