A new qt4 package is in [extra]. This replaces the current qt package.
All packages depending on qt need to be rebuilt to depend on qt4. We have done this for all official packages, but you will need to rebuild packages installed from the AUR that depend on qt.
Qt 5.x is now also available in [extra]. When you install both qt5-base and qt4 any Qt tool will refer to the 5.x version. We provide *-qt4 symlinks so you can explicitly force the 4.x version when you need it.