This weekend we integrated the animation and state machine APIs (part of the Qt Kinetic project from the road map) in Qt's master branch.
They were both released as solutions before, and we've had a lot of feedback. The APIs have been through a bunch of reviews and iterations, and we're really really proud of the results. So go and pull the latest version of the repository and try out the examples and the examples.
I'm not going to say any more about it, rather I'll just link to a bunch of blogs that we posted earlier. (PS. some of these have screenshots and even videos)