I have been able to finish Ultracopier 0.4 now that Qt5 has been released. This new release of Ultracopier is entirely based on Qt5, and is not compatible with Qt4. The new version based on Qt5 features very significant performance increases and faster start-up speeds. Currently, I am working to rebuild the rsync plugin. Other good news is that I will soon release some free plugins and on other improvements that will include better integration with Windows, mainly with regard to UAC.
Please note that the 32bit version for Windows is currently broken, although I am working on fixing this. Please report all bugs to me to help me speed development.