I think the biggest "scandal" we haven't seen the leakers talk about is the intelligence for US business interests.
As in the NSA literally going after foreign businesses and then turning around, and giving that information 1:1 to US corporations. That should be a pretty big scandal considering how much the US prides itself on being a capitalist market (i.e. survival of the fitness, not best politically connected).
But the US has a long history of this, and frankly at least they stopped starting wars in South American on the behest of US businesses so that's something...