Take a chill pill. Seriously. The season hasn’t aired yet and people are already talking about how ships are being sunk, friendships are being destroyed, and the entire show is heading down the toilet. But you know what? There’s literally no need to freak out like this.
What you saw in the sneak peek was literally clips from the first few episodes of the season. How do I know this? It’s simple really. It’s bad form to spoil the later parts of the season before the season even airs and also they literally have only filmed the first few episodes. So everyone just needs to take a deep breath and calm down, because not only are you having strong emotional reactions about a season that hasn’t aired yet, you’re also jumping to conclusions based on tiny clips from the first five episodes of the aforementioned season and the writer and producer’s vague, deliberately tantalizing remarks.
Just because Dean and Cas don’t see each other for a bit at the beginning doesn’t mean they’re going to have zero screen time together through the full season. Just because Dean is having a fling doesn’t mean he’s suddenly emotionally invested in a complete stranger. Just because Cas is spending more time with Hannah and she may have a crush on him doesn’t mean she’s suddenly become the most significant thing in his life. Just because Dean makes an offhand remark to Crowley that is usually shared between him and Sam doesn’t mean the writers have destroyed the brothers’ relationship forever.
All of you need to chill.