According to Bill Trinen in the latest Nintendo Direct, the North American version (and we assume Europe) of Animal Crossing: New Leaf will contain an exclusive feature.
He wasn?t quite willing to give up exactly what that feature might be but right after mentioning it, he talked about the online connectivity features in New Leaf so it may be something to do with that.
Read the full article at ACNewLeaf.com: http://acnewleaf.com/2013/02/14/loc...g-new-leaf-will-include-an-exclusive-feature/
My guess is something to do with making StreetPass house features online.