KaOS is a rolling release Linux distribution that uses the KDE Plasma 5 desktop as the default choice and pacman system for applications
Most notable major updates are the Boost/ICU stack, Gnutls/Nettles stack, a new Glibc 2.21 & Binutils 2.25 based toolchain, a move to Libpng 1.6 series, Linux 4 (4.0.5) and Systemd 220. The latter now made the logical step to merge a bootloader with an init system. With this ISO KaOS moves to the Systemd provided Systemd-boot for UEFI installs, Gummiboot is depreciated.