Btrfs hype: ... will kill ZFS ...
I think Linux fellows are too much excited.
But to some extent it's comprehensible:
It's tough for them being stuck to old-fashioned file-systems while ZFS is already today "zher gut!" in production.
Why one needs to shrink a pool?
Defragmentation?
What's that big advantage of taking a snapshot at every single modification?
Exabyte may indicate some internal limitation leading to extensive reengineering in the future.
Furthermore, df output is not even close to real as in ZFS (but that's not important after all).
Btrfs is still dizzy and verbose and experimental.
What more to say?
Perhaps (and I hope) in the future it will be as good (or better) than ZFS today.