As of initscripts-2012.07.29, the default format of /etc/rc.conf and /etc/crypttab have changed. See their respective man pages for more details.
The purpose of this change is to unify the configuration of systemd and initscripts. This will allow us to share code and documentation, and should make maintenance of initscripts simpler in the long-run.
The old format is still supported, so old config files should still work unchanged.