Just interested to get some discussion going on the final two tiers for Holy. These two tiers are the tiers we will likely be switching in and out on a fight by fight basis so it is important to pin down their niche. What it is they do well and in what sort of encounter we should be using them.
Level 75 Talents
Holy Avenger
Abilities that generate HP will generate 3HP and heal for 15 seconds. 2 minute cooldown. This is a talent that is going to become more and more attractive as gear levels rise. The key to maximising use of this talent is to ensure you're using a HP generator every other spell. This will become easier the more regen you have. The more haste you have the more you can fit into this 15 second window.
Stacked AoE:
This talent choice will shine best in a stacked AoE situation, essentially serving as a moderate AoE healing cooldown. The stacked rotation: HR > LoD > HS > LoD > HR > LoD> HR > LoD > HS > LOD. HR gets +30% heal then into a full LoD to burn off the HP. HS straight after for the HS splash with +30% heal then again with the LoD to burn off the HP. HS will skip the next rotation due to the 6 second cooldown. Always HR > LoD > HS rather than HR > HS > LoD to ensure you're not wasting free HP. Great for any healing intensive stacked fight, ala Ultraxion, Deathwing limb stacks etc.
Spread AoE:
Much less effective at this, but the priority will be to get off a HP generator, ie HS or beacon heal, and the follow up with a LoD. Essentially you can throw out a LoD every couple of seconds for 15 seconds. Not ideal, but spread healing is not our forte. The other alternative is to roll out EF if you've specced it.
Single Target:
HS and beacon heal for quick WoG. Does a beacon heal get the 30% healing bonus or is it technically Tower of Radiance that is the HP generator and not the heal itself. If it is ToR this will be significantly weaker than the boost AoE healing gets. If it is the heals itself this will be an excellent single target throughput talent.
Santified Wrath
AW lasts 30 seconds and the cooldown on HS is reduced to 3 seconds (2.5 with 4 set). Bit of an odd one imo as it changes AW from a throughput cooldown into a regen cooldown. More HS = more efficiency and more LoD / WoG and you will want to be using HS on cooldown to benefit most from the talent, which is really a hit on throughput. If I'm after a regen option, however, then surely Divine Purpose is the better option? Open to suggestions as to the niche for this talent for Holy.
Divine Purpose
Essentially HP spells have a 25% chance to give you another 3HP spell for free. This is largely an efficiency talent that, like Holy Avenger, scales well with gear. The more regen you have the more you will be casting beacon heals and HR and the more you will be using HP abilities. It also serves well for some burst healing, thought obviously this will be entirely random. Being able to throw out two LoD or EF in quick succession is very nice.
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Holy Avenger, for me, is the progress talent. The talent you pick up when you're learning an encounter. It also seems very strong for stacked AoE situations. The +30% healing has essentially turned it into a more powerful AW on a shorter cooldown, albeit with a shorter duration. If beacon heals benefit from the +30% healer rather than ToR being considered the generator it will also be a powerful tank cooldown. Divine Purpose seems like the talent you go for when you're comfortable with a fight. Sit back, relax, and take advantage of the free heals and regen. The randomness will make it less attractive for progress. Sanctified Wrath I just can't really find a niche for with Holy. The only time I'd really want it would be for Holy dps on Spine of Deathwing etc.
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Level 90 Talents
Holy Prism
The burst AoE heal and with a 20 second cooldown it is the most responsive and reactive in this tier. It does, however, require enough people stacked around a mob to make it useful. It could find a niche on fights like Blackhorn, bouncing it off the adds during purple void stacks and off the boss in the final phase after he roars. Equally, could be used on Morchok post stomp or any longer cooldown AoE damage.
It's probably stronger in 10 man than 25 since it is target limited, but in 10 this amounts to half the raid compared to 1/5th of the raid in 25.
Light's Hammer.
Probably the better choice for any more consistent AoE damage. Ultraxion or Deathwing burn phases seem like good examples of where it would get good use.
Stay of Execution
Despite the recent very generous buffs the nature of this talent still makes it weak. It's essentially lifebloom, but without the ability to roll and avoid the bloom, which is going to result in a lot of wasted healing on 'bloom'. It strikes me that you will choose this talent when the other options just aren't viable for the fight. Something like Shannox in 10 man.
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It seems like you will choose between Light's Hammer and Holy Prism based on the nature of the fight. Burst AoE or mobile AoE will favour Holy Prism. Light's Hammer will favour those fights with a more consistent AoE aura. Stay of Execution will be the talent you choose because the other two don't apply. The mechanics just don't make sense for healing and as such it will only be used as a last resort.
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But anyway, some thoughts from those who have actually done some raid testing would be nice. How have the talents fit into the first tier of raiding in MoP?