Currently, if you own an iOS device and want to update it, you need to plug it in to a computer with iTunes. The reason for this is because iOS updates are typically distributed as a whole firmware image to ensure security. All of that may change, however, if the latest rumors are true. Apple is apparently thinking of enabling over-the-air updates for iOS devices once iOS 5 launches. For Macs, the Mac App Store could become the "preferred" way to update Mac OS X Lion, even by making the Mac App Store the first place to get the new OS. For iOS devices though, this would be a first and would mean Apple could more easily distribute incremental updates to its devices. This could be down over WiFi, or if you have an iPhone, even 3G. Apple seems to be in talks with Verizon to enable OTA updates for the iPhone 4, but it is not clear if Verizon is the only one Apple has been in talks with for the matter.