Redd, Katrina, Wendell, and Sahara all visit your town from time-to-time.
Q: Are there any new animal moods?
A: Yep! There is now smug and big sis/uchi. Both are more mature personalities.
Q: Is it possible to have two towns in one 3DS?
A: Sadly, no. You cannot have two towns even with the use of SD cards. Your 3DS will automatically delete one of the towns. You need another 3DS to have another town.
Q: Do gold tools return? Are there any new tools?
A: Yes and no.
Q: Has the catalog changed?
A: Not really. However, there is an added search feature!
Q: Are the games region-locked?
A: Yes, they are. This means that you cannot play a Japanese version on an American 3DS or vice-versa. However, you can visit towns from any region, meaning that you can pick up region-exclusive items and DLC in other regions.
Q: Is this a single-player game?
A: I advise many to play this as a single-player game (it works better), but you can have four player profiles in one town. Only the first player gets to be mayor.