Castiel seems to be pondering something. Is it a deal with Crowley? Or is he wondering where Sam and Dean are? We're guessing that he didn't imagine Crowley being so drastic with his mutha. Like, "Huh, I sure didn't see that one coming."
The King of Hell is back to his old evil self. But what's his plan with Rowena and Castiel? He's looking rather chipper. Whatever his plan is, it must be making him feel confident. Long live the King of Hell!