The update to iOS 7 has changed the look and feel of Apple's mobile platform quite a bit, and it has also led to quite a bit of work for developers. Developers don't necessarily have to update apps for the new system, but if they don't it could lead to some very bad consequences including negative reviews from users in the iTunes App Store...Source: http://www.phonearena.com/news/Apps-not-updated-for-iOS-7-getting-hit-hard-in-the-App-Store_id48184
