I also would have preferred Anduin or Velen to be our first priest representative, but eh...not too broken up about it. I always did like Whitemane's design (my paladin actually had a similar color scheme before I even know who she was) and I'm also liking what seems to be her HotS redesign, assuming the art on Twitter is representative of it.
We did get another Paladin recently in the form of Yrel, despite already having Uther, so it's always possible there will be more priest-themed heroes and it's obvious that neither Velen nor Anduin are going anywhere anytime soon.