It doesn't relate to this week's episode, but it's never too late to get pumped for the next one:
http://www.broadway.com/shows/book-mormon/buzz/158185/robert-lopez-to-pen-south-park-episode-with-his-book-of-mormon-collaborators-trey-parker-and-matt-stone/
Robert Lopez created the huge Broadway-musical AVENUE Q and helped Matt/Trey create the even-bigger THE BOOK OF MORMON, so it'll likely be a musical episode. I don't think they've ever brought on a guest-writer before, so...keep an eye out.
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http://img812.imageshack.us/img812/3492/eponaharr.jpg
Nominate E P O N A.