The GNOME Control Center was revamped this summer and even the Haiku settings area while KDE developers are also working on overhauling their System Settings user-interface.

KDE developer Andy Betts has been working on improving the UI to system settings in conjunction with the Visual Design Group (VDG) and others. The settings are being organized, visuals being changed, and more.

Above is an early screenshot while more details via this blog post.