Automattic started the WordPress Publisher Blog, which is “aimed at helping publishers get the most out of WordPress,” in mid-January. If there were announcements of this, I missed them. I became aware of the new(ish) blog today, via the WordPress.com home page.
The most recent post is about Super Tuesday on WordPress.com. A more typical post is a Q&A on plugin development. Both of these posts, and indeed most of the posts so far, were posted by Raanan Bar-Cohen.