Ok I'll spoil myself....
I wouldn't exactly say there is alot to discuss from that specific clip, but I will add Misha does play omnipotent pretty well. He's pretty damn scary here. I still think that now that he has the power of Purgatory he just thinks he's a god if not THE God, but thats probably pretty obvious already. I say this jokingly, but I bet Chuck Shurely, the author/prophet will comeback to save the day and vanquish Castiel's powers.
The first half of this season will most likely be about working with Death to de-power Castiel, while the second half will probably be about why he got so power hungry and his road to redemption. All while an even bigger bad comes around (so you might be onto something, i might add it might even be Death controlling Cas) in addition to your occasional standalone filler episodes that loosely tie in with the main arc. Oh and of course more brotherly angst.
But I could be completely wrong!