At the shop I pre-oredered at (Playtime Video Games, Leeds) I got put in the first batch, but they can only retain it for 72 hours. So as long as I'm there within 3 days of release it's mine for sure. I know the guy in the store and he's opening at 6am so I can get mine.
I'm pretty sure if you placed a deposit on the console then they have to retain it for 72 hours. Think it's a legal requirement.