It will be interesting to see Misha Collins' acting skills stretched with the new character - I always thought he was very bland and one-note as Castiel. The Leviathans will be an interesting villain, I hope.

It's good to see Lucifer back in the mix - I hope that Sam is still somehow under his influence and not just genuinely hallucinating.

The scene with Death, Cas, and the Winchesters was probably one of the best of the series. Death is always so classy, and I his classification of Cas as a "mutated angel" instead of God gave Cas's position the needed deflation to conclude this little story arc.