King of Fighters 15 - Official Character Announcement:
Originally Posted by IGN
Shun'ei returns from KoF14, and will now play the role of the lead protagonist in the story. He has an updated look, and new moves on top of his previous set.
Kyo, who appeared in the very first KoF game, makes a return in a black jacket and bandana. Benimaru switches back to a sleeveless shirt design, and will be more familiar to how fans remember him.
Team composition in 15 will "differ greatly" from KoF14, but SNK won't be drawn on more details, only promising that more information will arrive soon. The developers call it the "most ambitious" King of Fighters game they've made.