Quote Originally Posted by 'Tonuss',index.php?page=Thread&postID=95753#post95 753
I am pretty sure that Blizzard was saying that they were going to tune heroics to be a good deal easier in WotLK, in order to allow more latitude in group composition. I don't know if this means that pet classes can clear heroics with pet tanks, but heroics may not be nearly as tough as they are now (granted, for normal groups they are no longer very tough, for the most part).
I've read something similar as well. They felt that some of the heroics required specific classes involved and they wanted to move away from that. Another reason why I think 4xpet tanks is a good idea.