Supposedly only preview night attendees can pick up their badge at the con on preview night, so they will be the only ones that have them. The satellite badge pickup location will be handing out the other badges, but I don't think there will be any shuttle services until the next day, so if you want to try you would have to find transportation to get you to the convention center.
That being said, each badge has a different color, so I imagine the preview badges will be easily distinguished from the regular 4 day badges, and the guards will be watching closely. Your best bet might be to try and sneak in with a crowd. However if the thin the crowd down and have you walk in one by one, then you most likely will not make it in.
They have good reasons for limiting the preview passes. It was getting as crowded as a normal day making it difficult for people to preview. My hope is that they are able to catch people trying to sneak in, because the less crowded on preview the better.
But that's my opinion......