Some quest ideas I'm working out:
Guard Revolt: The King's men are not happy about the changes Joe made and are plotting to overthrow the king, they see him as soft and weak and will attempt to recruit players to sabotage Joe's efforts to complete Dragon Basher and pressure him to restore the old game.
Cylon Revenge: It will be revealed that Cylon's are "artificial intelligent" sub-routines that Joe wrote that attempted to take over the game. There will be some by-play about how DevTeam is banned from using AI and the precautions Joe takes to make sure nothing like what happened can ever happen again. The Cylon's will be working to "time travel" so they can prevent Joe from deleting the original sub-routines.
Joe's Insanity: Led by Jasmine the barkeep, the computer characters suspect Joe has gone insane because he thinks that Queville is only a video game. This will be an expansion of Joe's Notes quest.
Flat World: Inspired by an "Anonymous" video (the hacker group) that contains a message to "flat earth'ers" I plan on a quest where computer characters are debating if the Queville world is flat or round. Issues such as being able to walk in any one direction and you eventually return to your starting location will be debated.
Kings Quest: In an attempt to restore Queville to former days of glory, the king will become a gardener and he will be focused on teaching players how to garden. There will be some educational aspects about nature, and a mild focus towards teaching the importance of growing your own food.
He (the king) will also be the computer character that will grant "player servers" when a player has earned the ability to run their own server (most likely quest based once they take the tutorial teaching them how).
Just putting some of my thoughts down. :)