2012 UI App Design Trends

There's a good overview of current UI app trends at Creative Bloq.

App user interface (UI) design, like web design, goes through many different stages. When the iPhone first appeared, many apps adhered tightly to Apple's Human Interface Guidelines. But as the device has become more widespread, and Apple itself has designed a number of apps for the device, UI design has gone off in numerous directions.
Whether it's the trend for skeuomorphism or the trend for clean, graphic interfaces, now is the time for user interface designers to get busy experimenting and developing new approaches to their creations, whilst making sure their apps remain inherently usable. We've scoured the App Store and elsewhere to find examples of trends in UI design

(and thanks for the blog mention!)