Had my interview at JFK yesterday, was barely asked anything. It looked like they were running about 15 minutes late, no biggie. The officer was very sweet. She asked for my passport and drivers license, took my fingerprints and gave me some instructions on what to do when I re-enter into the country the next time. She also asked me when my next trip was (Australia) and she was genuinely excited for me because she said Australia is the only other country in the world that recognizes Global Entry, but recommended that I read up on it (I haven't).
I then asked her a few questions which she patiently answered. Appointment took less than 10 minutes and I received my email notification within 15 minutes of walking out of the interview.