We have the synopsis for Supernatural season 13 episode 12.
 
“Various & Sundry Villains” — (8:00-9:00 p.m. ET) (Content Rating TBD) (HDTV)

THE WITCH IS BACK – Dean (Jensen Ackles) falls victim to a couple of witches, sisters Jamie (guest star Jordan Clair Robbins) and Jennie Plum (guest star Elise Gatien), who manage to steal a powerful book of spells from the Winchester brothers. When Sam (Jared Padalecki) and Dean go after the book, they get help from a powerful and surprising ally when Rowena (guest star Ruth Connell), back from the dead, intervenes to assist them. Amanda Tapping directed the episode written by Steve Yockey (#1312). Original airdate 2/1/2018.
 
I knew they wouldn't kill Rowena off screen. They haven't managed to kill her permanently ON screen. So more witches and Rowena as an ally. I wonder how she will react to Crowley being dead? What do you think of her return and a new witch duo?  Let us know in the comments or in the discussion thread for episode 13.