The guy that gave him the information can be charged under a variety of charges, violating his security clearance, divulging classified information etc, etc. He will not be charged with "treason any more than the Walkers, Aldritch Ames, Jonathan Pollard or Robert Hansonn. As to Assange, he doesn't come under US law since he isn't a citizen, nor did he act on US soil. And I'm not sure he comes under any of the espionage laws since he was not working for another Govt. nor did he transfer the information specifically to another Govt.
About the only thing he is guilty of is receiving stolen property.
He is not a terrorist as he has not engaged in any violent action or advocated violence, who ever mentioned "Diplomatic Trust" is naive and severely uninformed, the whole purpose of diplomacy is to BS other countries into acting the way you want and if there were any "trust" involved countries would not need Intelligence services.
I'm not even convinced this latest release was a bad thing.