While we don't believe that O2 has specific information on a release date for the iPhone 5, which has been rumored to not be appearing until October, it is interesting to note that their preparations should be complete by September 12th. From the notice to O2's retail stores:
The following is to advise that we are removing the old iPhone unitary between the 22nd August and the 12th September. This is a 3 week programme which will see all iPhone unitary swapped out for new iPhone unitary, and will of course prepare us for the launch of the new smart phone. At the same time we are installing an International Favourites bay to stores that can accommodate the unit, as well as replacing the existing magazine stand with a new freestanding stand.O2 offers several different styles of displays for the iPhone based on store type, and retailers have been notified of the types of new displays they will be receiving in order to plan appropriately.