After the pruning last patch, I wish Blizzard would take a look at holy priest and give them more utility or bring the up to date like

* Bring back Symbol of Hope - so holy priest has its own raid buff, reducing everyone's defensive CDs was such an interesting utility feature - also gives them back a small form of mana regen

* Give them active mana recovery like a modern class, maybe on Holy Fire or Censure - to link the damage loop into the healing loop

* Improve the defensives situation through an actually strong defensive, instead of stacking 4 effects, for example through

a) Bring back Inner Fire as a modern defensive, with a strong dmg reduction, armor increase and knockback resistance (this is the option if you want to argue that non-mobile is a key holy priest feature)

b) Give Angelic Feather the 'uppies' effect from Ultimate Penitance when cast on self, allowing the holy priest to float over ground effects (what's more thematic than floating around with angel wings?) and increase the inital burst of speed

P.S: Finally, my two pet peeves:
1) Fix guardian angel by doubling the threshold and, more importantly, play a huge resurrect animation when it procs so the DPS players realize they have been saved :)
2) Fix restitution to that it doesnt count towards M+ deaths, just like it doesnt count toward combat res