Laura Poitras, Edward Snowden and Glenn Greenwald have participated in a Reddit AMA (“ask me anything”).
An interesting answer by Poitras:
Yes, I do plan to release more footage from Hong Kong shoot. On the first day we met Ed, Glenn conducted a long interview (4-5 hours) that is extraordinary. I also conducted a separate interview with Ed re: technical questions. The time constraints of a feature film made it impossible to include everything. I will release more. I also filmed incredible footage with Julian Assange/WikiLeaks that we realized in the edit room was a separate film.