The cast for Matrix 4 continues to expand. Yesterday we reported that Neil Patrick Harris was on board for the sci-fi action sequel, and now Deadline reports that Jada Pinkett Smith will return to play Niobe. Smith joined the franchise in the sequels The Matrix Reloaded and The Matrix Revolutions with Niobe getting sizable screentime in the video game Enter the Matrix when the Wachowskis were trying something incredibly ambitious with their storytelling spread across mediums. Unfortunately, despite all the effort put into projects like Enter the Matrix and The Animatrix, the Matrix series ultimately fell flat as the …