I'm going to bet we don't have a Cain sighting again this season so that IMO leaves Crowley or Dean. Since Crowley is "King of Hell", and Dean is not yet dead - "Damned" seems more appropos for him. He's going to go to Hell (hence Damned) and yet is potentially in charge. I really hope they don't kill off Abaddon quickly, I'd like her to be in more than one more episode. AH can chew scenery so well.
All the titles are interesting to me. I'm a little surprised that we have three more eps (Meta fiction, Stairway, and Miracles) that seem potentially more Angel-story than Hell story. I hope they don't rush either but I could also see Heaven being closed a more immediate issue than Abaddon's factory. What if she gets ahold of those souls chilling in the "waiting room"? Those guys need to get tucked up in Heaven and away from her mitts.