There has been no official information or confirmation regarding Roronoa Zoro, a character from the manga and anime series "One Piece," making a black sword. Any future developments or changes to the story are unknown to me.

In the series, Zoro is known for his skill with three swords, and he has a goal of becoming the world's greatest swordsman. He has wielded various swords throughout the series, including his signature swords Wado Ichimonji, Sandai Kitetsu, and Shusui, each with its own distinct characteristics and significance.

While Zoro's sword collection may evolve or change as the story progresses, it is uncertain if he will obtain or create a black sword. The development of the story and the character's journey are ultimately determined by the creator of "One Piece," Eiichiro Oda.

To find out if Zoro will make a black sword or any other future developments in the series, it would be best to follow the official releases of the "One Piece" manga or watch the anime as they continue to unfold.