I didn't see it coming, either! I avoid all spoilers though, even episode previews and pictures and stuff, so if there was a hint out there, I didn't get it. And I thought it was gonna be Cas that saved Dean, too! But yes, this is much better :)

I'm so over Metatron, as are most people, I think. He should have died. Maybe they can kill him and bring Tessa back?