Leto of Dune (also provisionally titled The Golden Path of Dune) is a cancelled Dune novel that was to be the fourth book of the Heroes of Dune tetralogy, and the final book in Brian Herbert and Kevin J Anderson's current Dune contract.
It was originally expected to be published in 2013, however this is no longer the case.
Author Brian Herbert has said that after the Heroes of Dune series, there will be perhaps one more book series revolving around the founding of the Great Schools during the early Corrino Empire. They would tentatively be entitled, The Sisterhood of Dune, The Mentats of Dune, and The Swordmasters of Dune. This series has now been brough forward and The Sisterhood of Dune has been announced with a 2012 release date.