NixOS 16.09 Released, Reduced Disk Space & Package Hardening
NixOS 16.09 uses significantly less disk space now due to work on closure size reduction. This new NixOS release also now builds its packages with various hardening features for better security.
NixOS 16.09 also has support for PXE boot, uses X.Org Server 1.18 by default (except when using the AMD binary driver it's X.Org Server 1.17), and other changes. NixOS 16.09 is powered by Linux 4.4, GCC 5.4, systemd 231, and glibc 2.24.
More details on the new NixOS release via NixOS.org.