I geeked out throughout this entire episode. It was easily one of the best of the entire series if you ask me. What I appreciated most was how it all tied in to earlier seasons and it didn't seem as if they were just pulling a story out of their asses with a new set of big bad demons. I'm interested in how they'll explain the Lucifer thing, cause technically speaking he should not have that meatsuit, but I'm just being nitpicky.
If it turns out the BMoL are working under someone else altogether than this might make them interesting again as they'll now have a better motive than just wanting to help American hunters. Someone wants the Colt and I'm willing to bet its to open up the Gates of Hell again or something. That or to make more Colts.
But again, fantastic episode.