The official site for The Four Warriors of Light: Final Fantasy Gaiden reveals the upcoming DS RPG has a four player mode. Unfortunately, Square Enix is keeping it under wraps.
Matrix Software, the developer of the Final Fantasy III and Final Fantasy IV remakes, is also making The Four Warriors of Light: Final Fantasy Gaiden. Other familiar staff members from the DS remakes include Tomoya Asano and Takashi Tokita, one of the original staff members of Final Fantasy IV — for the Super Nintendo. Tokita says this game is a “classic fantasy RPG with today’s technology.”
The Four Warriors of Light: Final Fantasy Gaiden comes out in Japan this fall. Square Enix has not announced any plans to publish this overseas, but if they do I imagine the name will be something like Final Fantasy Gaiden: The Four Light Warriors or something like that.