This recommended update for Qt5, KF5 and Plasma5 provides the latest bugfix release.
For a detailed description of all changes, please refer to:
Qt5: http://qt-project.org/wiki/Change-files-in-Qt-5.4.1
KF5: https://www.kde.org/announcements/kde-frameworks-5.7.0.php
Plasma5: https://www.kde.org/announcements/plasma-5.2.1.php