The new software update for iPhones, iPods, and iPads looks just like iOS 7, but there's much more going on under the hood. There are some new applications like Health, new features like the ability to send audio messages in iMessage, and some huge foundational improvements to allow for seamless interplay among all devices.
Apple also has plenty of developer goodies that will make iOS more powerful, including 4,000 new APIs for home electronics, Touch ID, iCloud, cameras, games, and more.
Here, we've picked out some of the standout improvements and features in iOS 8 so you can get an idea of what to expect when the update goes live on Wednesday.