I'm looking forward to season 10 more than any of the past several seasons for a couple reasons. The first one is that from what I've heard Jensen say in interviews and at conventions, he has been wanting a chance to stretch his acting wings and play the character of Dean from a different angle, just like Jared has been given the opportunity to play Sam from different angles - Soul-less Sam, possessed by an angel Sam, Lucifer Sam, etc. I believe Jensen is going to make us all proud of him because he's going to be amazing as demon Dean! You know, I feel like I've watched him grow up as an actor, from little Eric Brady in Days of Our Lives, to Ben and Alec in Dark Angel, to Jason Teague in Smallville, and now 9 years as Dean Winchester. He just keeps getting better and better!
Secondly, I'm looking forward to seeing Sam act like my head canon Sam. I want to see Sam move heaven and hell to get his brother back. I want to see just how far he's willing to go. Because the Sam who played house with Amelia for a year, or however long that was supposed to be, while his brother was missing is not the Sam that I believe in. I just can't see how the writers actually thought that was something Sam would do. So I want to see Sam in full-on, protective-Winchester-brother mode, doing everything and anything to find Dean. And I don't think this season is going to disappoint!
Thirdly, Demon Dean singing karaoke. Need I say more?
What about you? What are you looking forward to?