Link to ONTD
So Lucifer will actually be in it, there goes my (vague) theory on Sam=Lucifer, Dean=Michael. Hurrah for the other hunters (and Chuck!) showing up again! And yesssss, lots of Castiel.
"[spoilerspoiler] muscle cars."
Fuck yes. Just make it a Good Omens crossover already, guys, you know you want to!
Edit: Yes, like this, OMG!! [Casting call spoilers!]