Source and details: http://blog.qt.digia.com/blog/2014/12/10/qt-5-4-released/
Qt 5.4 Highlights
Qt 5.4 introduces significant advances in embedded development & injects key graphics functionalities to cross-platform application development & device creation.
What's New in Qt Creator 3.3
Overview of the Qt Creator 3.3 new features. For more details, please see http://blog.qt.digia.com/blog/2014/12/10/qt-creator-3-3-0-released/