QtCreator was installed together with the Qt5 RC2 installer.

There are two Kits configured:
1. Qt5 RC2 from installer
2. System Qt4.7.2

Creating a new project via the wizard "Qt Quick 2 UI" configures to use the desktop Qt 4.7.2 Kit. This does not work because QtQuick module is missing as expected. Changing that manually to a Qt5 Kit solves this issue. The project wizard should not choose Qt4 Kits for QtQuick2.
The wizard for "Qt Quick 2 Application" does this already and hides all non Qt5 Kits in the "Kit Selection" dialog to prevent the user from choosing a wrong version. Something similar should happen in both wizards.