I am not of the opinion that classified information should necessarily be disclosed under FOIA. However, one could make a strong argument that because these programs have been officially acknowledged (which is inconsistent with the procedures for handling classified information), that their existence is no longer classified. NSA didn't have to make any public comment on the leaks at all; nevertheless, they chose to not only acknowledge the programs but also release a fair number of details, which would seem to have the effect of declassification. There is a similar principle in trademark law: failure to enforce the trademark results in a waiver of any rights granted by it.
A fundamental rule of classified information is that disclosure of said information does not cause declassification. You aim to make it unclear whether there is any truth in the leaked documents to cast doubt on the information.
Imagine if these were nuclear secrets. You would prefer it to be unclear so that replicating groups would not feel confident jumping into a nuclear project.
Obviously since we are talking about something that may violate Amendment 4, things ought to be a bit different. Probably not from a declassification standpoint, but rather from a legislate-this-out-of-existence standpoint.
The fact remains that as more and more information about the programs is leaked to 'adversaries', the more pointless the program becomes. You wouldn't play hide and seek if everyone could see you, right? Or if anyone shouts "Marco, FOIA!" they have to respond "Polo, docs!"
Most of the specifics here are still under wraps (who's being targeted, what specific patterns they search, etc) so the programs are still in pretty good shape. It's far too early to throw in the everyone-knows-everything-already towel. What's maddening is that the leaks on Capitol Hill are exactly the same, criminally, but are usually pre-filtered, pro-US and condoned by the Administration.
I imagine that documents remain classified even if/when a leak occurs of all/part of it. Just because someone has broadcast parts of it to the internet/world doesn't mean that there aren't aspects that remain secret and should remain secret. FOIA was never intended to reveal classified data, leak or no leak, until it has been de-classified. A few slides got leaked; let's not get carried away.
