You will have your own secretary in Animal Crossing 3DS. As you may already know, you can play as the mayor in Jump Out and to help you out with the day-to-day running of your town, you'll have your very own secretary. You can see her in the gallery of screenshots below.
Elsewhere, it has been revealed that you can add street lamps to your town as well as benches while you can also create your own exhibits at the museum.
Talking of the museum, you can take the fossils you dig up to be analysed before either donating them or selling them at the store. The official Animal Crossing twitter account also reveals that you'll be able to dig up crystals.