I have a warforged barbarian and I just noticed the other day, and maybe it has been this way for a while but you think by level 16 I would have noticed it before, when his rage wears off the little exhausted icon pops up. I looked in the feats and it said under WF immunities that exhaustion was one of them so is it new, an unintended thing, working as it should or am I just not very observant.