Not surprisingly, there is a delay in opening up the online registration to non-attendees (it was supposed to be a week after the attendee registration was up, which should have been 3 days ago).

They are aiming to have it ready early in the week.
http://www.seibertron.com/transforme...ng-soon/18730/

I haven't heard any mention of the attendee sets selling out or even doing well, so there shouldn't be any worry about the non-attendee sets. (or maybe, there will be more demand if less people are attending this year, due to all the delays)