WoE-specific support builds look like they're gonna be very different to normal builds, like Lyrinn said, max Rez/Agi/Recovery/Coluseo/Sanc all need to be there.
Which brings us to the question of how much healing skills to sacrifice for these...
I don't agree with all of this. Ress is still a difference between using it once or twice a WoE. With respawn kafras as long as you hold ground you are fine anyway. Sure - one more ress in a WoE is nice, but by no means the impact is so big it is a must have.
Agi up is inferior to Wind Potions. Any serious guild will have to be spamming those when moving. 4 points investment for a shorter CD on this skill sounds like a waste for WoE priest.
Recovery - we will have to see more. From those initial test WoEs it did not seem very useful. Also - has anyone done research on this skill targetting system? Will it 'count' only targets affected by debuffs or if you hit the mob of 10 people you will have to get lucky?
Even Sanc could be debatable. I do think it will be part of optimal WoE build, but standing still in one place is not so good and people who do so can easily get 100-0 inbetween ticks. Level 1 for 10% hp when breaking precast - that for sure. Right now there do not seem to be better places to invest those points, but I can easily see woe priests cutting on sanc if something better is discovered.
Coluseo is one skill I 100% agree on. It should be max on any priest that intends to WoE.