I love seeing all the little princesses wander around in WDW after they visit the boutique! That will be a great addition to DL.
Am I understanding you, though, that it will be inside the park, not in DTD? It seems like maybe it will cause a little bottle-necking in that area. The WDW location can get pretty crowded, just with the people taking their kids there. When you add in the people that stop to watch the make-overs, it can get down right cramped!
We'll have to see. In any case, glad to hear it is coming to the west coast.