A rather big change has gone into KDE’s SVN recently: Ben Cooksley (bcooksley) and Mathias Soeken (msoeken) have committed a complete rework of System Settings.
Compared to the previous implementation, System Settings now has two operational modes, one being the current icon-based view since KDE 4 (and also seen in Kubuntu prior to KDE 4), and a second view, named “Classic”, which reimplements the old KControl look and feel. The latter change is probably very welcome to anyone who found System Settings less useful than the old KControl. The current view used can be changed in the configuration options. In addition, upon hovering an icon or module that show if there are any sub-modules associated.