Pandu Nayak of google who worked/designed the panda update is working on this project and posted over at insidesearch here http://insidesearch.blogspot.co.uk/2013/08/discover-great-in-depth-articles-on.html
It’s all about the broad topic search:
To understand a broad topic, sometimes you need more than a quick answer. Our research indicates perhaps 10% of people’s daily information needs fit this category — topics like stem cell research, happiness, and love, to name just a few. That’s why over the next few days we’ll be rolling out a new feature to help you find relevant in-depth articles in the main Google Search results.
Two things I find really interesting is the mention of “perhaps 10% of people’s daily information needs fit this category” so will google be showing this to 10% of daily searchers?
Google have included a help centre article on how to be included in this new section which basically just includes scheme.org markup. See it here https://support.google.com/webmasters/answer/3280182