As for ZFS support and Docker, it will be via sdc-docker[4], our (emerging) end-point for the Docker Remote API. The progress there has been swift and everything is being done in the open; expect to see something in production from us in this first calendar quarter.
[1] https://www.youtube.com/watch?v=TrfD3pC0VSs
[2] https://github.com/mame/quine-relay
Am I right to assume then that there isn't going to be a SmartOS/SunOS 'docker' client which can understand zfs+zones / replace vmadm/zoneadm? I had planned on looking into writing this when they announced the 'new' pluggable architecture some while ago..
Because, that would freakin' rock...
So for us, it makes much more sense to implement the Docker Remote API on top of SmartDataCenter, which has the added advantage of virtualizing the concept of a Docker host to be an entire datacenter. But again, we would be supportive of any effort to straight-up port Docker to SmartOS, and we are generally supportive of any container effort that is looking beyond the (mis)design of Linux containers (including the work linked to here for FreeBSD + ZFS).
[1] http://dtrace.org/blogs/wesolows/2014/12/29/golang-is-trash/