What they are talking about is making it specifically illegal to publish the names of undercover people and stuff. All of the stuff about leaking information covered by the espionage act was already illegal since it was ennacted in 1917. It's already illegal but this will make it easier to convict them. prolly before with a good lawyer you could get out of it easily.
prolly cause of stuff like this and the Plame case.
http://codes.lp.findlaw.com/uscode/18/I/37/793