We didn't get a lot of time with Misha, but considering the last two Comic-Con press rooms I haven't had a chance to talk to him at all, I'll take the four and a half minutes we got with him. You'll even noticing me mentioning this fact at the beginning of the recording.
Below is the video for your viewing enjoyment. I've also included an interview summary below that because I know how uptight employers get over watching YouTube videos from questionable fan sites during company time. Bastards. :)
Castiel will first be seen in episode two of season eight in flashback form. He will not be in the first episode of the season.
He was asked about how he felt about playing Crazy Castiel. He found it difficult how to play Cass crazy based on what was on the page. It was done so Sam and Dean wouldn’t have this power ally that could solve all their problems.
“It actually took a little while to find the crazy Cass. Cause we were going in wildly different directions the first few hours of shooting and then totally course corrected it in another direction and I think what we come up with worked. It’s also one of those things, it’s television, it’s so fast. You get a script and you’re on the set in a matter of a couple of days. I came to the set with an idea in my head of how to do it and Ben Edlund the writer who was also directing that episode had a different idea in his head. So we talked and it’s like ‘Alright, let’s do yours.‘ Now I create a new character literally over the course of five minutes.”
What about Cass in Purgatory in season 8. “We don’t even know if Cass survives Purgatory or not.” Cass goes into survivalist mode in Purgatory and that “stilled his crazy mind.”
Will this change Dean and Castiel’s relationship?
“That’s a question that is briefly grappled with and then answered, why Cass abandoned and we get to find out whether it is for good or ill intent early on and that sets the stage for what the relationship’s going to be. So that question gets answered, but I’m not going to answer it.”