The latest ptr update for 4.3 brought some specific new changes to holy.
Holy Word: Serenity now has a 10 sec cooldown, down from 15 sec.
Guardian Spirit now increases healing received by 60%, up from 40%.
Tome of Light now reduces the cooldown of Holy Word spells by 15/30%, down from 30/60%.
Your thoughts on Holy for 4.3?
Serenity being a 10 second CD is as Blizz wanted, not for it to be up full time.
Guardian Spirit getting buffed to become awesome.
Tome of light changes as expected.