Comment 5 for bug 1130784

The stable version of PyQt4 supports only Qt 5 release candidate, support for final version is added in snapshots but not released yet.

Regarding this bug: are you going to do that in separate package set (i.e. python3-pyqt4-qt5-*)? I would not recommend to switch existing packages to using Qt 5 as theming support in Qt 5 is currently broken, so lots of apps will look ugly.