I was following this thread in the beta forums: http://forums.worldofwarcraft.com/th...=2000&pageNo=2
In short, it seems that heroics, while challenging at first, have become A LOT easier very quickly. Ofc this is partially due to simply learning and knowing the fight mechanics, but to a large extent also due to very fast item inflation.
Just something to bare in mind amongst the reoccurring QQ about heroic difficulties.