“iOS 9 is packed with more intelligence throughout, and delivers big updates to the apps customers use most — Maps supports public transit, a redesigned Notes app provides great new ways to capture ideas, and a beautiful News app delivers content that’s personalized to your interests,” said Craig Federighi, Apple’s senior vice president of Software Engineering. “With our new iPad features, users can take advantage of the power of iPad, working in two apps at the same time with Split View, Slide Over or Picture-in-Picture.”
For a complete overview, please see MacStories Complete Overview and First Impressions.
To update your device, simply go to Settings, General, Software Update and follow the prompts.
This update is about 1GB so make sure you are on wifi and have sufficient data allowance.