Starting with iOS 7, Apple redesigned the Camera app and it got an all-new shutter animation. Some would argue it's a little bit boring compared to the realistic camera shutter animation we had with iOS 6 and earlier.
Fortunately, anyone who's feeling a little nostalgic now have a way to get it back by way of a new free jailbreak tweak in Cydia's BigBoss repository called ClassicShutterAnimation.