Not that I know of, the damage and health of the mobs has probably just been reduced a bit - and due to the lack of proper combat log in the beta I cannot say for certain that Ironfist's aoe IS avoidable, I just made an educated guess from keeping an eye on healthbars, but I could be mistaken. I only managed to run it once on the weekend I was part of though, so don't take my word as law
-Raen