symphyl: First, thanks for posting the info that showed up online Thursday.
"I was going to be more concerned if I didn't see their registrations appear and no one show up at the conference, but they did show up online Thursday (other companies had theirs up for at least a week more)."
Actually, they've been registered as exhibitors for a long time now, as have many other exhibitors. Some companies (more usually the smaller companies) wait to post their registration details/confirmation 'til just before the event date, in case they need to opt out or make last minute detail changes.
I've observed this with several other exhibitor lists for several other conferences, and there's consistency with this factor.
FWIW
nilremerlin