Start planning now! No excuses! You got over a year.
2013 sold out with 64,000 attendees. WWP did not have an affect on them. Next year will be 3 full days! Word is their planning to allow a few more attendees, but keeping a cap on the total so it shouldn't be any more crowded than this year, which wasn't bad.
http://www.emeraldcitycomicon.com/index.php