There's plenty more in iOS 5, of course, including Wi-Fi media syncing; improvements to Game Center, such as user photos and friend recommendations; a split keyboard on the iPad; a new week view for Calendar on the iPhone; multitouch gestures for switching apps on the iPad; and AirPlay video mirroring for the iPad 2.

Apple's also beefed up its world-class Accessibility features, adding custom vibration patterns, the ability to blink the iPhone 4's LED flash for alerts, and improvements to VoiceOver.

Apple said back in June that the new iOS will run on the iPhone 3GS, the iPhone 4, the iPad and iPad 2, and third- and fourth-generation iPod touch--the same models that support iOS 4.3, in other words. Older hardware, like the iPhone 3G, get shut out.