Although Apple hasn't publicly announced the iPhone 5s announcement event, we all expect it to take place at the Apple campus on September 10th. The next question is when will Apple make is available in the market and now we think it is September 20th.

We now learn that T-Mobile has implemented a vacation blackout for its retail employees September 20th to September 22nd. Typically these blackouts are implemented when the company expects a flood  customer demand for the launch of hot new product. Although this isn't restricted only to Apple launches, there aren't any other product launches that we believe could generate that kind of traffic.

Typically Apple holds its events early one week and makes it available to the market the friday of the following week.

Rumor summary 

We expect the iPhone5S to include a faster processor, faster graphics chip, a slightly improved camera, a fingerprint sensor and a new gold coloured device. The iPhone 5C is expected to be a plastic backed device with more limited performance destined for the lower cost market.