Do you think that the infusion of light 2 set bonus will persuade 'many' holy pallys to go crit heavy? I've seen holy pallys on my server that make sure they have the 3507 haste and then go: mastery > crit > haste for the secondary stats.
(1) The crit has been very helpful to Eternal Flame HoT.
(2) The crit increased the amount of Infusion of Light procs.--
As you know, Holy Shock already has a 25% chance to crit, so they are getting their crit up to 20% and gaining another 5% from raid buff for a total of 50% crit chance with Holy Shock. So pretty much every other HS is a crit which procs Infusion of Light. So if you cast something like Holy Radiance next, the cast time is reduced by 1.5 sec obviously, but ALSO the SPELL effect is 25% STRONGER. That's a lot of heals being 25% stronger throughout the course of a fight with Infusion of light.
That is what has been explained to me from some Holy Pallys that have 2 bosses down already in 25 man normal. Currently, I see a lot of the high end raiders still going mastery > haste > crit. But though I'd ask if crit has the potential to surpass haste, keeping the 2 set bonus in mind.