All I know is that last year for the iPad 2, I was unable to be there at 5pm on Friday for the initial launch, so I went to the closest Apple store on Saturday morning and didn't have any luck, but the next day on Sunday morning I got there extra early and finally managed to get the iPad I wanted...
I think the rumor was that Apple was getting stock on Saturday (and subsequently everyday through the next couple of weeks,) but was holding that stock for the next morning. They might do something similar this year.