Here's an interview Sandra Gonzalez of EW did with Supernatural Executive Producer Robert Singer.  He really focuses on the remainder of the season after 7.17, including sharing some teasers about 7.18.  

insidetv.ew.com/2012/03/16/supernatural-ep-on-when-deans-drinking-will-come-in-handy-a-caper-episode-and-promises-leviathan-payoff/