A couple of hours ago Apple released the official iOS 7.1 for all devices above the iPhone 4, iPad 2 and and the fifth generation of iPod 2 (included).
Most of the significant changes are connected with iOS 7.1 stability improvements. Most iOS 7 users would agree with us, that the initial release of iOS 7 was not as stable as initially hoped to be.
Random restarts in the iPhone 5s and iPad Air have now been fixed. One of the exciting new features is the iOS CarPlay.
There are also a lot of small cosmetic changes such as even more rounded buttons, changed transperancy levels for better reading and a lot faster animations.