KDE Plasma is one of the most advanced, future ready (thus the name Plasma), desktop environments around which empowers users to stay in control of their PCs. KDE is not only the most customizable, expandable Des but also the most elegant one. Linux Mint’s own Cinnamon brings the same level of customization and control to Gnome 3. So with Linux Mint you get the best experience of the two leading desktop environments.
On top of the beauty and elegance of KDE, Linux Mint also eases the management of software and packages through Software Manager, which can now update APT cache in user mode without any intervention from the user, account to notes from Linux Mint team.
Linux Mint KDE 15 also features Software Sources, aka Mint Sources, which also features PPA, 3rd party repositories and authentication keys management. There is a ‘maintenance’ section which allows a use to fix APT related problems.
You can download Linux Mint 15 KDE (RC) from this page.