@Drink Tea Games: Flurry is a great plugin for analyzing the behavior of your users to help improve your game. In-app-purchase support for iOS & Android will be available until June.
@Martin: As you said, the native plugin system will allow you to write custom C++ code and provide it as QML components to your game. However, we did not decide on the capabilites for accessing our custom renderer (i.e. we do not use QGraphicsView for rendering, which is the reason for the huge performance gain compared to Qt 4 and still better performance than Qt 5).