iPhones get sent to the stores directly from Apple, and not from the networks distribustion centres, this is the case with all the networks, Fido, Rogers, Telus, etc. And therefore depends on how many handsets Apple will send to the stores at launch, and usually turn up at the stores the day before or early morning of launch day.
If Apple follow their previous methods and calculations (this has been used by them since the iPhone 2), they will not have enough stock in their distribution center to supply a decent amount of phones to the stores.
Apple give priority to their own stores with the phones then the networks (as they get paid by the network then).
Also not that some store managers will play the game of not having the phone in stock if you are looking to upgrade, than if you go in for a new connection (as staff get paid more commission on a new connection then a upgrade).
Trick is go in pretending to want a new connection, then once they bring the phone out, tell them its a upgrade not a new connection (if they say the phone is not a upgrading version then they are lying, thes stock is all the same)!
