Some may have missed this (what with the cycle preview), but there is a news article revealing the next Nightmare decks:
http://www.fantasyflightgames.com/edge_news.asp?eidn=4591
Its strange, the article doesn't show on the FFG homepage, but does if you click on "News"
Anyway, the next Nightmare decks are for The Hobbit: Underhill and Overhill! I for one found them quite hard enough as they were!