Bcfg2 1.2.1 is primarily a bugfix release, with over 2 dozen reported bugs and dozens more unreported bugs fixed. The only significant change from 1.2.0 is that regular expression support in Rules is now optional, and off by default.
A full list of bug fixes and cool new features is available at https://trac.mcs.anl.gov/projects/bcfg2/wiki/ReleaseAnnouncement/1.2.1
Download : http://trac.mcs.anl.gov/projects/bcfg2/wiki/Download
Mailing list : https://lists.mcs.anl.gov/mailman/listinfo/bcfg-dev
IRC : #bcfg2 on chat.freenode.net