Um dos desenvolvedores escreveu em esta edição sobre o tópico:
This has been closed, but to give a clear answer: lxd (at least as currently intended) will not do host networking. So in general you would port-forward to a web-server in a lxd container the same way you would do with lxc - you can pass in a nic from the host into the container and have your local router provide it its own address; or use route-based networking to container veths; or use iptables forwarding to forward host traffic into the container (which is what I usually do).
See https://help.ubuntu.com/lts/serverguide/lxc.html#lxc-network for more information.
Então, infelizmente, como as coisas estão atualmente, não há encaminhamento de porta, nem agora nem no futuro.