The newest Longmire book, A Serpent's Tooth, is due out April 23,2013
http://www.amazon.com/Serpents-Tooth...SIN=067002645X
Also, December 4,2012 there will be a book of 4 short stories released, Christmas in Absaroka County: Walt Longmire Christmas Stories.
http://www.amazon.com/Christmas-Absa...SIN=B00AAQNRY0
Apache