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On NixOS, is there any way to query for outdated system packages?

I know I can query this with nix-env for user-installed packages but I can't seem to find a way to know beforehand what will be updated when I run a nixos-rebuild switch --upgrade.

I'm thinking about using NixOS for deployment of a couple of servers in production but then I definitely need to be able to know what an upgrade will install before I actually execute it.

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To see what will be upgraded you can do "nixos-rebuild dry-build" to see the list of newly built packages.

If you want to deploy to a server, I think it's better to use nixops or manually copy packages with nix-copy and than call activation script switch-configuration.

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