Pawel Jakub Dawidek has announced he has prepared a port of the ZFS v28 file-system for FreeBSD, which is a newer revision of this advanced Sun/Oracle file-system than what is currently available in FreeBSD 8.1. This updated ZFS file-system brings a number of new features to FreeBSD-ZFS users including data de-duplication support, triple parity RAIDZ (RAIDZ3), ZFS DIFF, Zpool Split, snapshot holds, forced Zpool imports, and the ability to import a pool in a read-only mode.
Pawel, on behalf of the FreeBSD project, has also reaffirmed their commitment to providing ZFS support on FreeBSD. Even though OpenSolaris is dead
as Oracle killed it off, FreeBSD developers are looking forward to working with the Illumos project
ZFS v28 is newer than what's presently available for Linux users in the form of ZFS-FUSE
or what's being natively ported to Linux
as a kernel module by KQ Infotech and the Lawrence Livermore National Laboratories
Information on how to test ZFS v28 for FreeBSD against its latest head state can be found in this mailing list message