From a boxing standpoint it sucks that Im losing my aura.... as far as a solo DK is concerned though I think they definitely make the presences more interesting. They did a similar thing to the paladin auras if anybody read those notes as well. You can gain the "improved" effect of an aura if you talent it even if youre not using that aura.

I wonder if the +10% healing received from improved blood presence will stack wtih the +6% healing received from improved devotion aura... probably not =\