Knowing apple and cingular, they are going to be very well stocked on this new product.
Apple said:"This device has not been authorized as required by the rules of the Federal Communications Commission. This device is not, and may not be, offered for sale or lease, or sold or leased, until authorization is obtained."
When you get the FCC involved, it could be quite a while before anyone will actually own one. Also, it wouldn't be a big surprise if the iPhone that is actually released doesn't have all the great features that people are looking forward to. The FCC is very strict when it comes to devices that are capable of sending and receiving information/data. This could possibly take a rather long time.
Hehe I don't know cingular at all but I worked in a large electronics store last year for about 5 months over christmas (comet) and we never had more than 2 iPods at a time. I'm talking their biggest store in the UK here lol so maybe the stock won't be so great