It's called iOS 7, and starting September 18 you'll be able to download it for free.
Because of the drastic design change in iOS 7, many developers and designers had to rush to adapt their own apps to match Apple's style.
Over the past week, a handful of developers have jumped the gun and released new apps that have design elements that go along with iOS 7.
They're not alone. Facebook, Twitter, Evernote, and other bigger apps are all planning on launching newly designed apps for iOS 7. But you're going to have to wait for those.
In the meantime, here are a few apps you can download now to get ready for the new design in iOS 7.
Hipmunk's iOS 7 app is cleaner and simpler, allowing you to just focus on the task at hand: finding a cheap flight or hotel. You can see the old version on the left and the new one on the right.
Reeder, a news-reading app, released a brand new app called Reeder 2. The new app is extremely minimal and leaves you to focus simply on what you're reading. Reeder's old app is on the left and the new design is on the right.