1. Satoshi Nakamoto is NSA and he is going to pay the 1 million Bitcoin.
2. NSA will buy 1 million Bitcoin and give us a nice increase in the price.
3. NSA won't do shit . (which is the thing likely to happen in this case)
You've got the wrong end of the stick. They aren't blackmailing the NSA, they are selling the tech. Well, according to what little is currently known, but that is the gist of their 1million bitcoin reference.