Says so on the back of the box......can't find anything useful on google with details of how the circle pad pro works with Kid Icarus Uprising.

If it makes it dual analogue that's cool, but I think it may just be for left handed folks ( which would be useless for me).

I know Nintendo has a long history of releasing add ons and not supporting them....but I think the circle pad pro may be the least supported to date ( which is quite the accomplishment ).