This post is a suggestion for PvP UI improvements, as the devs are actively working on baseline solutions to problems players currently use addons to solve.
My first suggestion is implementing something similar to the Teea GCD tracker. In a game like WoW pvp, where instant casts are constantly happening, and the availability of information regarding what your opponent is doing is quite limited, I feel like a feature like Teea GCD tracker would help readily provide information to players on what your opponent is doing. A lot of WoW animations don’t make it super clear what the other players are doing a lot of the time, and I think something simple like showing ability icons next to player nameplates when they press a button goes a long way in improving playability.
Another thing I hope to see is more customization regarding my interface. Currently I have spell opacity set to 0% and I have a weak aura that displays the normal enhance MSW interface for 1-5 maelstrom weapon stacks, but for 6-10 stacks I change the colour of each stack to red, so I can easily tell exactly how many stacks I have. I hope that I can tailor my UI in a similar manner when Midnight is launched.
I also pray for the day I can play a night elf shaman 
Thanks for reading,
Sha