iOS 7.1 seeded by Apple, they are now changing the UI after every update
Finally Apple has seeded the next version of iOS 7, its iOS 7.1 now. iOS 7 is the only version where everyone has experienced some minor/major changes in the tweaks as well as user interface. Even this time they have managed to change lots of things. A new dial pad has arrived with newly tweaked call and hang-up buttons. You will not be able to see the full profile photo of the caller after this update, or maybe some changes in settings will bring that option back. The slide to lock screen is also changed along with iPhone 5S camera to have default HDR enabled.
The next major update in iOS 7.1 is CarPlay. For the first time, Apple has added CarPlay support in iOS. This new feature will complete scoop out your iPhones functionalities and add them to the touch screen panel of your supported device. Siri will also help you out for sorting some basic things. They have also added a toggle button asking you to switch on the parallax or dive into effect while you are selecting a wallpaper. There are lots of more changes spotted by 9to5mac, you can read them here.
You can even read the full documentation of iOS 7.1 HERE