ETA for backporting to 8-STABLE is set at one month, but testing patches are available.
A big thanks to pjd@, mm@, avg@, kib@ and all others involved in this excellent subproject!
ZFS actually has a fine future. Oracle's version of ZFS is currently somewhere in the early 30-ies, including encryption support. With the death of OpenSolaris, other ways are being looked into to get the support into the open version of ZFS - at the very worst, a compatible reimplementation is likely.
Personally, I have been testing ZFS in various environments since it has appeared in FreeBSD. It went through a long period of initial instability (not only because of ZFS itself but also because of slight and not so slight differences between FreeBSD and Solaris) but the latest version shipped in STABLE (8.2, ZFS v15) finally looks really stable. I have been running 8-STABLE before it became 8.2 on some very tricky workloads (producing regular panics with earlier versions) and I'm very happy to say everything works fine now!
If v28 turns out not do destabilize ZFS in any significant way, it really will the best thing since RAID was invented :)