Some old and new tidbits in here...

+ Place your house wherever you want
+ Customize the exterior of the home, fence included
+ Shopping center that grows
+ Ability to regulate store hours
+ Build bridges, lamp posts, benches, hammocks, etc
+ Ribbon-cuttings for mayoral projects
+ Mayoral secretary to accompany you
+ Model village with StreetPass homes
+ Customize patterns on furniture
+ Customize each part of clothing
+ Share patterns via QR codes
+ Wall-hanging items
+ Swimming
+ Diving
+ Camping
+ Picnics
+ Eating ice cream outside
+ Night clubbing
+ Visit an island via boat
+ Minigames at island: timed hedge race, whack-a-mole, etc
+ View sky at any time
+ More part-time jobs