There have been quite a few iOS 7 posts here and most of them focus on the flat vs skeuomorphic design. This is in my opinion the least of Apple's worries. They have the best designers in the industry, they have been designing UIs for years.
But here is Benedict Evans raising some smart points about where iOS has to improve the most.
The obvious short-term solution would be to give them something like Android 'intents', or a shared file store or something. But that, I think, misses the point. The problems we see with apps, and social, and files on iOS are things that evolved over the past 6 years: Apple now needs to think about laying a conceptual framework for how they'll work in the next 5 years.
Read the whole piece: http://ben-evans.com/benedictevans/2013/4/14/heres-jonny