If you could add one thing to your class what would it be?
For my priest I would add: a glyph that changes all the Spriests shadow skills into light skills. None of the icons or actual skills change, just a pure swap from purpley to golden.
What you YOU want for your class?
On par mobility or gap closer with other melee classes…
Fun rewarding gameplay that doesn’t make me look over at other classes wishing that I didn’t waste my time playing the game with an artificial handicap.
Retribution aura that isnt dependent on a party or raid member dying.
Retribution aura that buffs my team instead of just myself.
Going back to huge beefy holy light heals instead of meh holy light heals.
I want silence back on Holy.
<10 char>
Another defensive CD.
Just old MoP glyph of stampede back, and my rotation would be complete thematically and mechanically… ah but what a pipe dream.
I wish we had mark of the wild back 
Resto Druid to actually get something different beyond an instant cast once a minute.
Like splodey mushroom, or (though I know it was a nightmare to balance) Symbiosis.
I wish shamans had all their old totems back. I know we got some of them back, but I miss just dropping all four totems and having a bunch of relatively minor but effective buffs.
Class combinations!
Realistically? Rogue with a sniper rifle.
Also hundreds and hundreds of glyphs.
if i could ask for one thing? …easy, to be OP 
For my retail hunter I would love if he held the bow at different positions for the different shots.
More ghost wolf forms.
Defensive Ability
Something to do while I’m running away other than spam a Shock
Totems that buff other people
guaranteed balance for the expac
Give monks a 4th spec built around eminence healing.
Less deep wounds, more burst
Some mobility and the abolishment of Breath of Sindragosa.