Joystiq has a short chat with Alice of Wonderland. Her comments on BlizzCon are darn insightful:

What could have made it better?

Fan areas:

• by-server gathering spots
• by-server tabled banquet (like SOE)
• fan art gallery
• player panels: be fun to hear the hardcore talking
• developer pods: devs can man a pod and show off their work, answer questions, etc
• social games (e.g. tabletop areas, werewolf tables, etc)
• special area for cosplayers to show off (podiums!), like Tokyo Game Show
• historical galleries, e.g. the history of WoW music (which is brilliant), who composed it, how it was made, how much it cost, the story behind the making, etc. More STORIES…
• better lighting