IMDB has posted casting for episode 13.01
It lists Jared as playing BOTH Sam and Lucifer and Jensen as playing Dean AND Michael.
IMDB is not always right in its reporting and this is not an official announcement, but it it something to talk about while we wait for Comic Con! What do you think? Would you want to see a return of Lucifer in Sam? Do you want to see Jensen play Michael? How do you think this would happen in the context of the show? Are we talking multiple AUs? Give us your thoughts in the comments or in the discussion thread for season 13 episode 1.