Assuming that they do have a main character ready, we know that they also have Bubo ready. So here are their choices:
1. Delay the official announcement of Bubo (which we already know about) until Toy Fair and reveal a main character on January 11th, then reveal Bubo during the media blitz, fan frenzy, and publicity heavy madness of Toy Fair.
2. Give us Bubo now so we have something to tide us over for a few weeks until the eyes of the industry are on Toy Fair, and then give us a main character announcement while websites everywhere are overflowing with reports and pictures of the latest news, and while all of the Sideshow fans are glued to their computers watching the announcements pile up and talking about it in the official Sideshow 24 hour live chat in between winning contests and posting about it all on the Freaks board during peak levels of online user activity.