Published by Sega, in contrast to Culdcept Saga which was published by Bandai Namco.
According to Recap, it will be based on the PS Culdcept Expansion. It will probably be the same exact game, which will basically make it worthless. Except perhaps if you plan to take your DS to a friend's house to play hotseat games. Or if there's a single-cart multiplayer mode. Meh.