As far as i understand, either through a wireless router. Or, if you don'yt have one of those, a usb connector adapter watsit. Hopefully, the one they used with the Ds will be compatible (costs around £25) erm.... if not, presumably they will bring out another usb adapter wotsit. (proably the smae price)
Sorry im not very knowledgable about this.
Basically, you have two options; wireless router or £25 usb adapter.
(Im assuming you have a computer and internet )