Qt 5 is the 5th major version of the popular GUI toolkit for implementing graphical applications. This version contains major changes, and Qt Quick is central to it.
Qt 5.0 has been released. Check out the Qt 5 landing page [qt-project.org].
Mission of release
Qt 5.0 will be the foundation for a new way of developing applications, where Qt Quick is in the center of Qt. Qt 5 continues to offer all of the power of native Qt C++, and we don’t want Qt 5 to be disruptive for existing code developed for Qt 4.
Qt 5 enables highly sophisticated user experiences, offering applications the full capabilities of OpenGL/OpenGL ES graphics acceleration. In this respect, Qt 5.0 is a feature-driven release with time-to-market requirements especially for embedded environments. This implies that we should keep the scope of Qt 5.0 limited to the essential, and add more features and add-on modules in the upcoming minor releases.