Tetsuya Nomura has stated that there are no immediate plans for a sequel to Dissidia, although it was discussed. However, depending on fan requests and the success of the first game, this may change in the future. According to an interview between Takashi Arakawa and Yoshinori Kitase (director, writer, and producer) with a German gaming site, Kitase stated that a sequel would be "very interesting", and might even include Kingdom Hearts characters, although it would still have to be discussed with Disney.
Nomura has said that a potential sequel would include Kain Highwind, Gilgamesh, and Sazh Katzroy representing Final Fantasy XIII, but would not include Kingdom Hearts characters.