already posted this on Temp bros/Space Person's forums, so i figure for the people who are curious about the new boss in 3.3.5 here ya go:
http://www.youtube.com/watch?v=J_S277XtDvY
And from what i've gathered you have a 3 phase fight consisting of 4 abilities beyond tail swipes/breaths
-Phase 1 - Starts at 100% ends at 75%
- Armeggedon - Giant flaming ball of death (location marked with Mimi rocket indicator) = upon hitting ground results in insta death for anyone bad enough to stand it it. Additionally creates giant flaming X (like from Marrowgar)
- Fire Bomb - Placed on target, after ticking down knocks back all players close to player placed on and creates a giant flaming circle that should be avoided
Upon reaching 75% boss creates a portal for all to enter to begin 2nd phase
Phase 2 - 75-50%
-Orbs - 2 main orbs circle the ring constantly, occasionally raid warning will occur and a beam will connect the orbs for around 15 seconds, Turn the boss and don't get hit by the beam
-Shadow Bomb - Same as fire bomb, but with shadow damage
Phase 3 - 50-0%
This is where the fight gets fun, seems to have a ping pong aspect.
Boss creates portal where 1/2 the raid must exit, from 50% on down the fight is a DPS tug of war between both sides of the portal. The boss retains all abilities from phase 1 and 2 for each side of the portal respectively, meaning people who are fighting in the portal will remain in the shadow side and fight the boss there while others fight from the other side. Unsure of what damage is required to push the dragon to either sides of the portal, but the fight from then on is paying attention to raid warnings and DPS on Q.