Board Thread:Naruto News/@comment-3279282-20150618134845

I'm not entirely sure, but it seems that a new novel series titled Naruto Shinden (Naruto True Story) will be released as well. It seems to be about Itachi and Sasuke (titled "Itachi Shinden" and "Sasuke Shinden", respectively). The official page gives 2015 as a release date.

Edit: The release is in fall 2015. The announcement was translated by OD@reddit: "Possessing eyes that clearly see the truth, they are brothers who are at the threshold between hope and despair. These are stories that will explain Itachi's past and Sasuke's future." 