Be you a Holy Priest or Discipline Priest, there is some information for you to look over again. Here we mainly talk about Holy Priest versus Discipline Priest. If you are interest in this and want to know it well, you must take close notice.
   What stats are the most important for both Holy and Discipline Priest?
   As Holy Priest, you may have chosen to keep spirit at the top of priority when it comes to gear selection and augmentation; however, with that being said, you can value Intellect much more so than during Burning Crusade raiding. You can reserve yellow sockets for Brilliant Autmn's Glow, attempting to maintain some semblance of balance between spirit and intellect.
   But as Discipline Priest, Intellect is the most valuable stat, as it contributes to every aspect of healing. A bigger mana pool means bigger returns from Rapture, Shadowfiend and Replenishment. It boosts crit for more throughputs and more Divine Aegis procs. Haste is what you look for second, but only until about 10%. After that you feel stacking it is hurting other stats.
   What trinkets are both Holy and Discipline Priest presently using and how do they help?
   For Holy Priest, you can make use of the Majestic Dragon Figurine and the Spirit World Glass. The two trinkets provide excellent mana regeneration for boss encounters. Spirit World Glass really shines when there is predictable incoming damage in which you can pop the on use ability after a clearcasting proc, followed up an Inner Focus + Greater Heal to allow for maximum regeneration time spent OO5SR. If the full 20 seconds is spent not casting or "cheating" the rule, it usually will return about 35-40% of 20k mana pool.
   But for Discipline Priest, you can make use of the Egg of Mortal Essence from Emblems of Heroism along with Forge Ember from heroic Halls of Stone. For the most part you use the Egg for the raw spell power, though the proc is a nice to have when it goes off. Forge Ember gives a nice hefty amount of crit. You carry around a few other trinkets for different situations. As usual, you are able to use Darkmoon Card: Blue Dragon for long fights as Disc casts enough spells to make it worth a fair amount of regeneration.
   How do Holy and Discipline Priest handle AoE healing?
   As for Holy Priest, before casting an AoE healing ability you first determine what caused this person to be damaged, and if they are in close proximity to other players. If they are alone you cast a Flash Heal, if they are grouped up you would obviously cast Circle of Healing. In fights like Gluth and Loatheb though, you use Prayer of Healing considerably more (After decimate and when necrotic aura drops off, respectively).
   As for Discipline Priest, in a five-man, Prayer of healing is the spell of choice. In a raid, it's not as useful as you need to heal outside your own group. As Discipline you need to be more aware of who is taking damage and who is going to need the most help. Usuakklt you throw shields around the raid on every cooldown for the Borrowed Time buff, but you try to keep them on the tank and the squishiest members of the raid. Prayer of Mending on cooldown as well, this is especially useful during the Vortex in the Malygos encounter.
   At last, the problem for Holy is their inability to observe and react. It is so easy to fall into the habit of tunnel visioning your raid frames that you forget to observe what exactly is happening around you. But for Discipline, the obvious change would be more AoE healing tools, whether it is talents to modify Prayer of Healing or Holy Nova. But since that would be trespassing into Holy's niche, more talents to make Renew useful to a Disc priest would be good.