Surprise! http://imgur.com/a/KbbUP

The order is a little messed up but they're almost all there.

Flex

Immerseus
Fallen Protectors
Norushen
Sha of Pride
Galakras
Iron Juggernaut
Dark Shamans
General Nazgrim
Malkorok
Spoils of Pandaria
Thok the Bloodthirsty
Paragons of the Klaxxi
Siegecrafter Blackfuse
Garrosh Hellscream

Normal

Immerseus
Fallen Protectors ...

Updated: 2012-09-12

Heroic Deathwing!!!

Heroic Blackhorn

Heroic Hagara

Heroic Ultraxion

Heroic Yor'sahj

Heroic Morchok

Morchok - 30 November
Yor'shaj the Unsleeping - 30 November
Warlord Zon'ozz - 30 November
Hagara the Stormbinder - 30 November
Ultraxion - 1 December
Warmaster Blackhorn - 1 December
Spine of Deathwing - 1 December
Madness of Deathwing - 6 December

Heroic Mode:

Morchok - 5 January
Yor ...