Kubuntu 16.04 as part of Ubuntu 16.04 Official Flavors has been release and announced by Kubuntu Development Team, this release powered by long-term support of linux kernel series 4.4 and brings KDE Plasma 5.5.4 desktop environment as default desktop environment, Include the KDE Applications 15.12.1 software suite and the latest KDE Framework 5 packages. Also include Non-KDE applications LibreOffice 5.1 and Firefox 45.
Released as LTS version, Kubuntu 16.04 LTS will receive software updates and security patches for a period of 3 years. for more details about this release you can refer to Kubuntu 16.04 LTS release notes.