That finale involves the names of U.S. citizens targeted by NSA surveillance, according to an interview Greenwald gave to the Sunday Times. He told GQ that the last of the big stories based on the documents he received from Edward Snowden would be published this summer.

"One of the big questions when it comes to domestic spying is, 'Who have been the NSA's specific targets?,'" Greenwald told The Sunday Times. "Are they political critics and dissidents and activists? Are they genuinely people we’d regard as terrorists? What are the metrics and calculations that go into choosing those targets and what is done with the surveillance that is conducted? Those are the kinds of questions that I want to still answer."

The question is certainly important, and echoes a question then-Senator Joe Biden asked in 2006: "What do they do with this information that they collect that does not have anything to do with al Qaeda?"