Spoilers For Season Four (Supernatural)

Spurred on by my own theory, I went in search of even more spoilers for season four and found the following. 

Everything is under the cut.

( Who are you, my dear Castiel? )

I am stoked about this season -- even more so than last because of the mystery surrounding it. Plus, we're finally going learn of how Mary knew the yellow-eyed demon. In other words, this season is going to be f**king awesome. I can't wait.