When Super Mario 3D Land comes out on November 13th, expect a new firmware update that you will have to download on your Nintendo 3DS.
Currently, the available firmware right now is at 2.1.0-4U in North America. It seems that the new firmware found Super Mario 3D Land will be the ones that Nintendo will be releasing this November with an improved friend list.
As for Mario 3D Land, expect our review near the release date.