Apple may not be planning on releasing OS X Mavericks at the same time as iOS 7 in September and may instead roll out the next version of its Mac OS at the end of October. September 10's special media event is expected to give us new iPhone models and a release date for iOS 7, but if sources are correct, we won't be getting Mavericks on the same time schedule.
OS X Mavericks may mot ship until late October
Insider sources talking with 9 to 5 Mac said Apple chose to stagger its rollouts to focus on the iOS 7 launch as well as new iPhone models. The iPhone 5S and iPhone 5C are expected to make their first official appearance on September 10 and to be shipping by September 20. If so, iOS 7 will be available about the same time.
Apple promised a fall release for iOS 7 and OS X Mavericks, although the company didn't say whether or not they would ship at the same time. While getting Mavericks along side iOS 7 would be nice, holding off a little could also coincide with new Mac updates. Apple introduced new MacBook Air models at its World Wide Developer Conference in June, but has yet to update the MacBook Pro and iMac, or to release the completely redesigned Mac Pro.
Apple doesn't comment on rumors, so there isn't any official confirmation on when OS X Mavericks will ship. Waiting until October does, however, seem reasonable since that gives the company time to focus on its iOS 7 and iPhone product launches.