Here's a picture of the new Costco in Lodi, California with their 'soft' opening in the form of a VIP party. As you can see, there was a lot of people waiting for it to open, with some waiting for over an hour.
Yes, there were a lot of people there. Although you couldn't buy anything at the store that day, they had a lot of food samples (including those from the food court).
(Click for larger image)