Not to go all conspiracy, but maybe it's US Government providing the info in order to discredit Snowden and lay the groundwork for getting rid of him?
that does, frankly, seem the most likely outcome of all this, specific orchestrations aside.
no one really has the stomach to roll back the security state, so after a good catharsis, these programs will get legitimized, we'll accept pervasive surveillance as the new normal, and adjust our lives accordingly.