'The Fedora Project has put back plans to make Btrfs its default
filesystem. It will now take over the role in Fedora 18, rather than in
version 17 as originally planned. That is the conclusion based upon an
amendment to the Fedora 17 planning page on the Fedora wiki and a ticket
in the Fedora Engineering Steering Committee (FESCo) tracking system.
The May release of the Linux distribution will therefore retain ext4 as
its default filesystem.'