Actually, I'm inclined to bet this was one designer's concept and not the work of many people reviewing prototypes and giving feedback.
Design-by-group tends to produce boring, cluttered, seen-it-before layouts with little innovation. This seems to be on the completely opposite end of the spectrum -- with no one saying, "Uh, wait -- I think you need to make it clear that you can scroll for more info."
(And also: "Uh, I'm not sure developers are going to take kindly to Google requesting access to their microphones so soon after the NSA revelations.")