Quote Originally Posted by JohnGabriel View Post
This is only sortof true. Its Cata dungeons only, and yes they have more health but mobs in Normal are level 90 and mobs in heroic are 85.

As to why they did that, It makes no sense to me.
Perhaps to mess with bots or gold farmers? I have no evidence for the claim but I can't think of anything else that makes logical sense from a "why would you make this significantly harder" angle.