I highly doubt anything will happen to Greenwald. He's too high profile, and this case is too high profile. They got away with prosecuting leakers because they were obscure.
I think they'd like the controversy to die, not stoke it.
The other Scandinavian countries may not have had such close ties to the US as Sweden, however US-Sweden relations have a rich and storied history[1] stretching back quite far (with particular emphasis on defense against Soviet aggressions).
The issue is prosecution of journalists for publishing said info, which is not a crime.
http://www.rcfp.org/browse-media-law-resources/news-media-la...