The Brainz' Blog
The MusicBrainz Weblog (a.k.a. the Brainz' Blog) is the main place for big announcements (major new evolution, releases) and updates about the community life and service status.
It's located here: http://blog.musicbrainz.org/
While comments are opened on it, hence letting people provide short feedback, it is not really convenient for in-depth discussions, which are usually rather hold either on the MusicBrainzWiki or on the MailingList