so, it looks like there may just be Either a Cow level, a level to kill ponies similar to my little pony (please, PLEASE let that be factual) OR, BOTH!
First up, the Pony info that was posted at MMO-Champion.
[spoiler]Secret Level - The Pinnacle of Ponies
Strings
Battle For Ponies
The battle for ponies is about to begin.
The Pinnacle of Ponies Event
Ponies_HopePrison - Hope's Prison
PoniesPurificationTimer - Purification Timer
Bridle_Ponies - Bridle
Rewards
Quest_Act4_PoniessFall_MonkReward - Magic Fist Weapon
Quest_Act4_PoniessFall_DHReward - Magic Hand Crossbow
Quest_Act4_PoniessFall_BarbReward - Magic Weapon
Quest_Act4_PoniessFall_WDReward - Ceremonial Dagger
Quest_Act4_PoniessFall_WizReward - Magic Wand
Bosses?
TentacleHorse - Rainbow Western
Unique_TentacleHorse_A - Midnight Sparkle
TentacleHorse_B_Unique - Nightmarity
Unique_TentacleHorse_A - Nightmare is Magic
Unique_TentacleHorse_B - Generosity in Death
[/spoiler]
Next is the Small amount of refrences i could find to cows in the database.
[spoiler]
A2_dun_BoneyardWaste_DesertCave_Random_Special Secret Bovine Wundercave
Secret_Cow Angry Cow
[/spoiler]
So, who is going to take Peverse pleasure for MANY a day killing @#$%ING PONIES? i know i will!!!