The Nickel author is the Nix author or at least one of contributors (Eelco Dolstra) so as long as the project is successful it will likely be introduced back to Nix.
Edit: actually looking at contributions Yann Hamdaoui seems like the main contributor, but I saw Eelco contributing to it.
Edit: actually looking at contributions Yann Hamdaoui seems like the main contributor, but I saw Eelco contributing to it.