WordPress Publisher Blog is (going to be) written by various team members at Automattic and their goal is to help all publishers get the most out of WordPress. They will cover features that are often overlooked, highlight plugins that extend WordPress functionality and showcase interesting sites being built with WordPress. They are looking for publishers working on innovative projects using WordPress and would like to field questions from users. From the comment that Raanan left on PressedWords, it would appear that they want to focus on large WordPress installations that are doing lots of custom work and help publishers find the proper resources.
A definite daily read!