Realistically you think they'll burn Cas' body? I wouldn't think they'd go all the way back to burn his body, if it's after they get put in prison, but I guess anything is possible. In the sneak preview it's definitely earlier in the morning when they light the pyre than the pic of Cas' body on the table in the Lake house with the angel?
A matter of semantics: if you’re waiting to be tried, arrested, or in for less than a year, you go to JAIL. Only long term (a year plus) incarceration is technically called Prison. Legally.
As to Cas’s body? I don’t know. I think burning it might be a really good way to end the episode with ALL THE PAIN, so I still think we’ll see it.