The most exciting part of this work for me is this PR: Git hashing as a new file ingestion method --- contains #3754 by Ericson2314 · Pull Request #3635 · NixOS/nix · GitHub
If Nix archives can be stored as Git object trees, it will inherently allow much more de-duplication of content. => cheaper storage, less bandwidth usage and easy hard-linking. The distribution mechanism is sort of orthogonal to this and it could be applied to zeroconf types of setup as well.