Hopefully this means everything, including booting from ZFS, should work out of the box.
[1] http://www.phoronix.com/scan.php?page=news_item&px=Ubuntu-ZF...
In retrospect, it probably wasn't a very good idea because my / is on an SSD and ZFS on Linux doesn't support TRIM (I'll probably go with XFS if I ever reinstall), but it's totally doable.