I think we did learn who Juliet is, she's a coward. She couldn't stand up to her Ex, she couldn't stand up to the Dharma rep, she couldn't stand up to Henry, nor could she admit her true feelings. She's an instrument who is yes, cold, she is a coward in the face of an alpha male.
I think it's interesting that both she and Ethan are fertility doctors, and Claire is very important to them.
Wednesday's will be all about Charlie, Hurley and Dessie. SKWEE!