The problem is not just collected intelligence, as a passive action, but more active actions, like planting backdoors ready to accept (maybe destructive) commands in foreing critical networks.
I would be very worried if that new information is so destructive that compared with all that was released till today is still like a doomsday weapon, and thats why it was not released yet. Even if Snowden didn't got that information, that they consider that information that they keep secret is so destructive by itself is just a reminder that so far we seen just the tip of the iceberg, and if you are outraged by what you know that they are doing, you will be far more then realize how deep the rabbit hole goes.