Prior to the release of the Apple iOS 5 at the WWDC 2011 annual conference in San Francisco, a MacRumours reader has reported that iTunes may have leaked a new feature on the next-gen mobile operating system.
If your device has Automatic Download enabled for apps, your updates will download to your device without having to sync, the report mentions.
Normally, to update applications either on the device itself or in iTunes on a Mac/PC, a user intervention is required. Since the new Automated Download feature mentioned by the reader does not currently exist in present iOS, the leaked info suggests that the feature is of the coming Apple iOS 5.
Besides this, there have also been rumours of the company making some kind of wireless syncing and over-the-air updates function in the past, possibly associated with Apple's iCloud offering.