Ooh. That *something* that Crowley told Dean that we the viewers weren't told? Maybe that was it? "Just so you know, Dean, if your brother does try to cure you with his blood, it'll come across as him finishing the trials and he'll die." Intriguing possibility. But then...would he be so calm now that Sam captured Dean? Or would he be in a panic about the gates to Hell getting closed? What else could he have up his sleeve?

Can it be Tuesday now?