The Qt Creator 4.3 Beta release adds a QML code editor to the Qt Quick Designer. Qt Creator 4.3 also now supports CMake's server-mode, which was added to CMake 3.7. CMake server-mode allows for much better integration with IDEs.
Qt Creator 4.3 also has experimental Clang refactoring support, mobile development improvements for iOS, and CDB debugging support.
More details on today's Qt Creator 4.3 beta release via blog.qt.io.