Apple today released iOS 7.1 to the public. This update features a number of user interface tweaks, in addition to various bug fixes and other tweaks.
First photo: iOS 7.0.6
Second photo: iOS 7.1
1.iPhone call screen
2.Notice darker “slide to unlock”
4.Some changes, notice the FaceTime, Messages and Mail app icons. (see bigger)
6.Notice the bolder keyboard
7.Notice the Twitter icon and keyboard.