Andrey Lipattsev of Google, doing the whole Head of Search Quality role, agreed to answer some questions for Anton Shulke of http://webpromo.expert/google-qa/who invited Bill, Jon, and I, to ask whatever questions we felt he'd be free to answer. I wouldn't call the resulting 1hr hangout mind-blowing for revelations, but it was certainly an interesting hour (and let's face it, what may seem less than mind-blowing to me may still be pretty enlightening for those less heavily involved in SEO).
While some of Andrey's answers seemed a little 'safe', I certainly understand that they (Googlers) have to be careful not only of what they say, but how they say it, and we were free to press if we felt an answer was either evasive or non-committal.
The video is embedded in the page above, or alternately can be found on youtube
Among the key areas discussed were social signals, mobile search, quality ratings, the 'chinese wall' between paid and organic, and a whole lot on tracking and personal data concerns.