And in reference to earlier posts, it would be difficult to surpass Season 4. Lumen was a terrible character, but Brother Sam wasn't. A lot of people hated the finale, but that would be a difficult show to end.
I think there's a decent chance Harrison kills Batista if Angela contacts him again, and maybe Harrison even killed Hannah. And Angela's last words on the episode while on the phone, "I need Dexter Morgan." Great stuff.