I had this same question and the response I got from several people was that you can sit in the bar area without and ADR. However, you cannot sit at the bar itself because there are no chairs around the bar. There are several small tables in the bar area, kind of like at Red Lobster or Chilis, where you can seat yourself. However, from what I read, there are not that many tables in the bar area. So if you depend on this for dinner, you may not get a table and not be able to eat.
Hope this helps. I decided to wing it, and if I get a table then GREAT!! If not, I can eat at the fish and chips place if it is open, or hope for walk up table.