Here's some info from a lucky guild:
Freya
Boss info
* Health - 1,394,500 (Normal) / 4,183,000 (Heroic)
* Mana - 234,190 (Normal) / ? (Heroic)
The fight takes place in a lush, oasis like valley inside Ulduar. There are three Elder boss-tree mobs you can choose to kill or not, appearantly they are similiar to Sartharion's hard mode if you choose not to kill them the fight gets considerably harder as each elder buffs Freya and her adds.
* Elder Brightleaf - The essence of Elder Brightleaf increases Magic damage dealt by Freya and her Allies of Nature by 50%.
* Elder Ironbranch - The essence of Elder Stonebark increases physical damage dealt by Freya by 50%.
* Elder Stonebark - The essence of Elder Ironbranch increases Physical damage dealt by Allies of Nature by 50%.
As you engage Freya, she will spawn multiple adds and start healing herself. She starts the fight with 150 stacks of a buff increasing healing on her by 4% (=600% at the beginning of the fight), a stack is removed everytime one of the add she spawns is killed.
_________________
