Blizzard just announced on Twitter that patch 9.1.5 will be released on November 2nd.
The patch is pretty light on the content side but will introduce Legion Timewalking and the Mage Tower will also be making a return.
Void Elves, Nightborne, Lightforged Draenei, and Highmountain Tauren will also be getting new customization options in the patch.
Players will also be able to switch freely betwen covenants, and conduit energy will be removed.
The full patch notes can be found here.