With the release of the Fox 2012-13 primetime schedule, Napoleon Dynamite had been officially canceled by Fox after its rookie season, while Bob's Burgers has been renewed for a third season.
Update: Since Bob's Burgers is noted on the just released schedule as not being replaced at any point in the 2012-13 season (like, for example, Fringe), my assumpion is that it’s going to have more episodes added past the 13 that will be “left over” after this season, so I’m assuming it can be termed a renewal for the 2012-13 season. If that gets clarified by Fox to the negative, I will update.
So technically we're getting 22 episodes next season. Rumor is we're getting this seasons left over 13 episodes during the summer.