Yes, the way MK entry works now is that at some point...sorry have no clue exactly when.....people are allowed through the security check and turnstiles but are held in the area in front of the train station. Shortly before opening, the train pulls into the station with Mickey and a ton of characters aboard waving at the crowd below. A family is chosen to open the MK and is also on board. There is a countdown, etc and then the crowds are allowed to enter the park.
Not sure if the family thing is every day or not. There is probably lots of info on the theme parks board.