http://www.animenewsnetwork.com/news/2011-09-21/natsume-book-of-friends-get-4th-season-in-january
I am SO excited for this! ARE YOU? What do you hope to see/find out more about in the 4th season?
Personally I really enjoyed this season how Takashi and Tanuma got closer as friends in The Broken Mirror episode... I'd like to see more episodes like that. (And of course I'd love to see more of Matoba... it's always nice to have a clear-cut villain sometimes. XD)