The QApplication::setOverrideCursor doesn't work anymore. To demonstrate, add this code to a suitable place in an existing application:
The cursor doesn't change to waitcursor in 5.0, but does in 4.8. Only visible effect of setting override cursor is that if mouse cursor is moved to the edge of a resizable window so that it changes to resize cursor, and then subsequently moved back inside application window, the cursor remains as resize cursor instead of changing to default cursor. This behavior goes away if QApplication::restoreOverrideCursor() is called.