Apparently, it's being named Animal Crossing: New Leaf in the US. Thank goodness, I live in Canada and I prefer this name to Jump Out.
http://www.officialnintendomagazine.co.uk/43301/animal-crossing-new-leaf-is-the-new-name-for-3ds-sequel/
http://www.officialnintendomagazine.co.uk/43301/animal-crossing-new-leaf-is-the-new-name-for-3ds-sequel/