Google has completely rewritten the Quality Ratings Guideline, the resource that their team of quality raters uses to rate websites for Google. This one is a brand new version, rewritten from the ground up, so it isn’t just a refresh of the old one (and most doesn’t even resemble any of the old Guidelines that SEOs scrutinized in detail whenever one got leaked). It has some great new insights into how Google is approaching the search results and what it takes to be a top ranked website.
Great stuff here from with some analysis of the new quality rating guidelines. It provides more evidence that Google is evolving and going in a new direction for the next few years.