MacRumors has now received word from several sources reporting that Apple is indeed beginning to prepare its store employees for the program. Apple has reportedly sent materials to its stores to support the initiative, while the first line of store trainers will be receiving instruction about the program today. Those trainers will then begin training other store employees next week ahead of a program launch.
It's unclear when exactly Apple plans to begin accepting trade-ins; however, the program could launch alongside the release of the iPhone 5S and iPhone 5C. Apple is expected to unveil those devices on September 10th.