I don't necessarily think that there will be anything groundbreaking about DS once if is completed. In my opinion, however, I certainly will not be considering it just a shopping mall either. DS will offer a bit more than just run-of-the-mill shopping.
For me, the difference maker are the new dining locales that will make this more of an experience. I live near King of Prussia Mall near Philadelphia. Pretty impressive as far as malls are concerned. DS will just be so different than that. Places like The Boathouse, The Hanger, The Edison, Raglan Road, etc., will add a unique flavor to it. Not to mention the amount of nightly entertainment that is everywhere. My real concern now is crowd management. It is insane now and this isn't even finished.