From what I can see, this is largely a fight about people understanding the mechanics and moving correctly to avoid taking damage.
The biggest threat to healing is Lightning Storm that does huge AOE damage (55k per second for 15 secs) to the raid every 1.5 minutes. There will be 3 of these before boss enrages.
Here we want to pre-plan raid-wide healing CD's.
I am thinking we pop 2 healing CD's per Lightning storm. It is really important to remember when your turn is. By the time someone calls it out in vent, people will be dead. Just know when to use your assigned CD before the fight. One healer not getting this right will waste a lot of mana from the rest of the healing team or cause a wipe.
This video I like but things may change when the patch goes live: http://www.youtube.com/watch?v=-gEflG0nSU4
Please add ideas or questions to this thread.