We released NixOS 22.05 and nixpkgs 22.05, both codenamed “Quokka”!

Announcement: https://nixos.org/blog/announcements.html#nixos-22.05
Release notes: https://nixos.org/manual/nixos/stable/release-notes.html#sec-release-22.05
Upgrade instructions: https://nixos.org/manual/nixos/stable/index.html#sec-upgrading
Downloads: https://nixos.org/download.html

A highlight is Nix 2.8, which brings experimental flakes support.

The other notable change is the new graphical installer, which @vlinkz led the integration of with @davidak doing a lot of additional work.