The OpenOffice.org Newsletter is published once a month, usually in the first week or two. It is distributed via the low volume "Announce" mailing list, which is used for all the important announcements from the Community.
You can read past issues of the Newsletter by browsing the "Announce" list archives - look for "OpenOffice.org Newsletter" in the Subject line.
If you would like to subscribe to the "Announce" list, send a blank email to firstname.lastname@example.org. You will be sent an email with instructions how to confirm your subscription. Once you have confirmed your subscription, you will receive any future emails from the "Announce" list until you unsubscribe. Please note that the mailing list is fully automated, so if you use spam-filtering software, please make sure it will accept emails from email@example.com and firstname.lastname@example.org before you try and subscribe.
More frequent news?
One of the best ways to keep informed is to listen to people blogging about OpenOffice.org. For a list of blogs and Planets (consolidations of blogs) see the OpenOffice.org Bloggers' Page.