With a strong chance we might see N'Zoth this expansion and it being confirmed we'll finally deal with Azshara and her Naga before the expansions end, how much would you like to see a sprawling underground cavern network of coral reef structures to represent the Makrura empire with the capital city of Mak'aru being an end-game dungeon/raid?
Perhaps we'll find out that the Makrura were the ancient Aqir remnants hiding in the non-collapsed portions of the Azj'Aqir Empire near Zandalar that got sucked down under the Great Sea during The Sundering. Afterwards, they were soon blessed with hyper-evolved bodies able to withstand the crushing pressure of the Great Sea thanks to N'Zoth (very similar to the Naga), and have worshiped the God of the Deep ever since. Their buildings would look very similar to the animated Silithid hive structures, but made out of coral reef instead.
https://wow.gamepedia.com/Mak%27aru
Just some rough concepts of how I envision it looking. What do you guys think? Would you like this concept to manifest in Battle for Azeroth?