With patch 5.2 coming closer and closer it was a good idea to peek into the Pandaria lore even more.
Basically, what we know is: Mogu were created by Titans to battle an Old God (possibly the one Mantid are worshipping), after fulfilling their mission they were abandoned and clueless what to do. The Mogu clans fought each other without any sense or reason, until Lei Shen decided to look for the source of their existance. He found out they were titanic creations, and with this knowledge and his personal skills he was able to subdue a Titan/Watcher (who the hell knows, Ra-Den) and channel his powers, becoming powerfull emperor. He also learned the secrets of the flesh-shaping and utilized it to create slaves to build his empire.
As far as I'm concerned there are 2 races that are created by the Mogu: Saurok (by flesh-shaping some lizards) and Grummle (by flesh-shaping some troggs). The rest of Pandarian races were already there: Mantid were the enemy of Mogu, Yaungol were the Tauren who just hunted around, Jinyu were the evolved Murlocs, Hozen were... well, a bad joke. But it is said that Mogu had three races to serve them. Saurok, Grummle, and Pandaren.
What do we know about the Pandaren, then? Well, they were slaves of the Mogu. After Lei Shens death they managed to start a rebellion and break free, removing the element of cheap labor from Mogu culture and pretty much stopping their reign. Wait a second, what do we know about the Pandaren BEFORE that? Pretty much nothing.
So, the thing is: Pandaren are a Mogu creation as well. Just like they flesh-shaped lizards to create Saurok, they did this to some pandas and we all see the resoults. Pandaren were not enslaved - it was a race that was created to be slaves. A bit like machines, created to serve, but somehow managing to regain free will and breaking their chains. Similiar to the Terminator series? A bit, I guess.
Let's summ it up. A race of betrayed soldiers, who fought an incredible evil god, was left alone by their masters. After years of being helpless, one of them managed to find out about their origins and get the power they deserved. With this power they created their own servants from nearby lifestock. And those servants were used to build amazing temples, bridges, palaces, and a huge wall that separated the Mogu from their greatest enemies. And, somehow, the slaves revolved, crippling the empire and turning it to dust. Are we working for the rebelled machines to fight off the mankind?
Of course, it's taking things too far. But some facts are quite interesting over here. Are the Mogu really evil, are Pandaren their creations, should we concentrate on helping them?