邪恶力量 is going to season five but that will be the end if Eric Kripke gets his way. He along with Jared and Jensen want it to end at five seasons. If it goes beyond that it doesn't look like any of them want to be invloved.
Sam told it in an interview that there's gonna be a 5th season but it will be the last, because he 说 he was starting to get a drag and if they continue it will be boring and always the same.
I'm don't agree with that i'll always 爱情 邪恶力量 and it's so bad there planning no 更多 seasons :S But i'm happy there's a 5th season :D