So I watched the wwdc 2013 conference and what I gathered(for ios 7) from it was flat designs and thin fonts BUT then when i watched the session videos, I was quite impressed with some of the features. The items i found to stand out was:

• Advanced Text Layouts and effects with textkit
• Core Image Effects and techniques – this is the blur effects
• Core data performance
• custom transitions
• Sprite kit!

I think i’m more excited with sprite kit as there is some awesome features offered with xcode 5, including an inbuilt physics engine and image atlas’ing.