Oh well, at least they're doing it
One of our major complaints w.r.t. OSX (I refuse to use the awful name they cooked up) has been HFS+ being stuck in the mid-90s. Sure, it supports a lot of UNIX-style stuff, but it still suffers from issues I hadn't seen in other OSes since the FAT32 days.
It was sad that Apple didn't go for ZFS; it could've been a good replacement for HFS+. But now that they're rolling out their own next-gen filesystem, things may finally move into the 21st Century.