I also found another tweet by him that says (in reply to someone) " There are all sorts of secrets I have I'm not publishing - it's public interest v. harm analysis at the heart of journalism."
[1] https://twitter.com/ggreenwald/status/343454484917280770?p=v
[2] https://twitter.com/ggreenwald/status/343453682387542016?p=v
I hope he's making a good judgement call on not releasing the technical information. A lot of people are already writing this presentation off as fake and meaningless.