[dfghjkhgbfd]

>What kind of thing could possibly be leaked, and how badly will it damage international relations?

Well it might be tricky politically for Germany to get behind the US if the leaks contain plans for a 'final solution' to the problem of muslims living in America.

Mostly it's just lots of governments that have opposed torture in public statements are going to be embarrassed when it's detailed how their security services stood there while the person was electrocuted then asked their questions. The UK just made a big payout to lots of Gimto inmates to avoid this coming out in court.