Dovecot is being updated to version 1.00 from 0.99 There is a configuration file issue here which probably should be briefly addressed in the release notes. See http://wiki.dovecot.org/UpgradingDovecot
I have included this information to http://fedoraproject.org/wiki/Docs/Beats/PackageNotes. A subsequent version of the release notes will include this. Thank you for the report.