Don't know if anyone has discovered this, but I was watching a detailed video tour of CF when they explained a new feature in town hall which I think is pretty neat.
When you talk to either Pelly or Phyllis at town hall one of the new features is called "I have a problem". This is actually Nintendo's way of censoring the game. When you select it, you choose one of your villagers. When you do, they will ask you what is the specific problem. The options given are: Bad catchphrase, bad letter or horrible clothes.
If the host is to be believed, this censors any questionable behavior you may have gotten while playing online.
For example, if you have a new villager that came from another village and his or her catchphrase was "b*tch", you select the "bad catchphrase" and it erases it. If that villager shows you a letter that confirms that the previous village owner was a closet furry (you know who YOU are...) you can delete that letter at the house. Finally, if the villager is wearing a shirt with the nazi logo on it you select "horrible clothes" and it reverts to the villager's original design.
Not a big feature per say, but its a pretty neat one, especially for parents who may have gamer friends with dirty minds and don't want their kids or someone else finding that (not to mention it saves Nintendo's skin if they get a complaint about it).