The next guest, who has been to a few BotCon's already - Stan Bush.
http://www.botcon.com/BotCon09/guests09.cfm

The one big failure with the current BotCon organisers, is the ability to get new guests. I don't think the earlier organisers ever had a BotCon that was made up of all or mostly returning guests. It shows their focus on selling dozens of toys is spoiling it for the many returning long-distance attendees (who pay more to get there - yes, including me), who want to see something new, not the same guests every year. Gregg Berger will be fun, but if they had any imagination or effort, they'd commit to getting in someone new like Frank Welker or Corey Burton.