The first Release Candidate for Linux Mint 17 KDE "Qiana" has been launched and completes the collection of desktop environments for this distro, after Cinnamon and MATE.This current version of Linux Mint 17 KDE "Qiana" comes with KDE 4.13.0, which is the latest version available right now. The rest of the packages are in place and, if you ever opened a KDE-powered distro, then you won't be surprised by anything.
Just like the other flavors that have been released so far, this one is also based on Ubuntu 14.04 LTS and will benefit from an extended support period, after it becomes stable, of course. The Linux mint developers announced a while ago that they intended to only base their distros on LTS versions of Ubuntu.
It will take a while for the final version to arrive, but it shouldn't be that far off into the future. Until then, users can test this release and see if it's worth an upgrade.
There is no official announcement for this release, only the official download links. Users can download Linux Mint 17 KDE RC "Qiana" right now from Softpedia.
Remember that this is a development version and it should NOT be installed on production machines. It is intended for testing purposes only.