Assuming this post doesn't disappear, I'll try to keep it updated with known information about the T12 druid gear/set bonuses.
* Restoration 2 Pieces - Your periodic healing from Lifebloom has a 40% chance to restore 1% of your base mana each time it heals a target.
* Restoration 4 Pieces - When your Lifebloom blooms, it instantly heals up to 2 nearby injured targets for the same amount.
As for the 2 set bonus:
1. For a druid, base mana is 18635.
- Anyone wishing to know the base mana for other classes should see this post.
2. 1% of base mana = 186.35.
3. Assuming LB ticks once every second, it has a chance of granting 372.7 mp5.
- [40% (chance to proc)] * [186.5 (1% of base mana)] * [5 seconds] = 372.7 mp5.
- This value will increase with haste since LB ticks faster with haste.
A common theme with all of the healer 2 set bonuses is that they will provide similar amounts of regen (although each class has a different base-mana value, and druids are the lowest of all of the healers).