Yes :) We are working on pluggable execution drivers. The current driver (lxc) will be replaceable by eg. libvirt, plain chroot and eventually zones, jails etc.

There is actually someone experimenting with Jails support already (can't remember his irc handle atm). If you want to come by irc or open a github issue, we can put you in touch.

I've wanted to build something like Docker for FreeBSD Jails for a long time. I've been watching the Docker project since it was announced, and I spent this past week almost exclusively working with Docker and testing it for a possible production deployment (hope you get have a 'production ready' release soon :). In short, I would love to have Docker on FreeBSD!