Interface
Maelstrom Weapon Tracking
As Blizzard rushed to disable addons with Midnight launch, they were unable to provide adequate UI elements of their own to keep track of combat information. There is no way to track your main resource Maelstrom Weapon in the base UI except for a tiny little icon in the Cooldown Manager.
This means that you will need to use an addon to keep track of Maelstrom Weapon properly, of which I recommend ArcUI. I will be using this myself, not only for Maelstrom Weapon, but as a full replacement for Blizzards lacklustre Cooldown Manager.
Macros
Mouseover Macro
#showtooltip
/cast [@mouseover,harm,nodead][] Lava Lash
Mouseover macros are not as necessary as they have been in the past, but still nice to have occasionally.