New info about upcomming "Return to the Broken Shore" patch updated WoW community website. You can find look on the new Cathedral of Eternal Night dungeon, new additions to the Class Hall quest line, and whow will be constructed defences on new questing area on Broken Shore.
We still don’t have any exact date of patch launch, but blizzard has launcher already started pre-uploads.
Hospitality isn’t the Legion’s strong suit, so don’t expect them to roll out the welcome mat for Azeroth’s forces. You’re going to need to break through their defenses, clear the beach, and establish a foothold for your base. Similar to the launch of World of Warcraft: Legion, if you’ve reached max level, Khadgar will have a quest for you which will begin a solo scenario on the Broken Shore.
Find more info on World of Warcraft community website.