Rejoice, Guix v1.0.0 has finally been officially released!
https://www.gnu.org/software/guix/blog/2019/gnu-guix-1.0.0-released/
I've been using this as my primary OS for 2-3 years now and cannot recommend it highly enough - Best thing that's ever happened to my computing life.
Now we're just waiting on GNUnet and Hurd ( ._.)