He gave a rather expansive interviewed with Wired. Here are the most recent revelations:

• He left “bread crumbs” which should have let shown the NSA what he took. He ascribes the fact that they continue to be surprised to incompetence, but I am not buying it.  I think that acknowledging what was taken would put our state security apparatus in the position of validating some programs that have not yet come out:

Snowden speculates that the government fears that the documents contain material that’s deeply damaging—secrets the custodians have yet to find. “I think they think there’s a smoking gun in there that would be the death of them all politically,” Snowden says. “The fact that the government’s investigation failed—that they don’t know what was taken and that they keep throwing out these ridiculous huge numbers—implies to me that somewhere in their damage assessment they must have seen something that was like, ‘Holy sh%$.’ And they think it’s still out there.”

• Some of the leaks appear not to have come from Snowden, which points to a 2^nd whistle blower.
• The CIA’s IT infrastructure is archaic.
• Syria did not shut down its internet at the beginning of their civil war, it was an NSA cock-up:

………One day an intelligence officer told him that TAO—a division of NSA hackers—had attempted in 2012 to remotely install an exploit in one of the core routers at a major Internet service provider in Syria, which was in the midst of a prolonged civil war. This would have given the NSA access to email and other Internet traffic from much of the country. But something went wrong, and the router was bricked instead—rendered totally inoperable. The failure of this router caused Syria to suddenly lose all connection to the Internet—although the public didn’t know that the US government was responsible. (This is the first time the claim has been revealed.)

• The NSA has setup  a program called Monstermind, which would have it launching cyber-attacks against other nations without human intervention.
• The final straw for him was when James clapper flat out lied to congress about spying on Americans.  (I liked his use of the phrase, “Banality of Evil,” to describe this, though I didn’t like his use of the boiling frog metaphor, which is scientifically inaccurate)

There are more revelations to come.

It is really worth the read.