The newest Patch, 3.2, is on the PTR and it will come with alot of new content, new items sets, and like always alot changes for all classes.
For us holy priests there aren't to many changes (yet). The biggest change is a nerf of our Prayer of Healing.
Prayer of Healing: The percentage of spell power this spell gains in healing (per target) has been reduced from 80.7% to 52.6%.
This is a big nerf, and i will miss the power of my PoH, but with all the new items we will get in the new instances I think it will be still a powerfull spell. The next change affecting us indirectly is Replenishment which will be nerfed by 20%.
Replenishment: This buff now grants 1% of the target's maximum mana over 5 seconds instead of 0.25% per second. This applies to all 5 sources of Replenishment (Vampiric Touch, Judgements of the Wise, Hunting Party, Enduring Winter Frostbolts and Soul Leech).
On the other side the mp5 stat on items with mp5 will be increased by 25%.