The fact that even affiliate stores (basically authorized resellers that associate with the carrier) are taking stock of the phone this early shows that Nokia has learned a few lessons since the Lumia 920 launch: announce and ship within two weeks, have enough stock in the colors available to keep people happy.
That latter one still needs to be testing, but if affiliate stores are already receiving shipments of the 41MP monster, then we can be sure that Microsoft Stores and AT&T posts should have enough on hand, otherwise they would have restricted the channels.
The Nokia Lumia 1020 features a 41MP PureView camera, optical image stabilization (OIS) and a BSI sensor for low light photos. In addition, the device has switched out from the 920’s LCD for AMOLED and adds a Xenon flash. The phone will be on sale at AT&T, Best Buy, Microsoft Stores and AT&T resellers starting Friday, July 26th. Pricing is $299 on a 2 year contract or $659 off-contract.
Edit: Clarification as stores have yet to receive shipments for sale but rather are getting in-store devices for managers and testing pre-launch.