All I really know for now is you find him walking around in Edenia at night. He's in front of one of the buildings. He doesn't appear as Zombie Kang when you see him. He's wearing his MK4 attire. But when you fight he fights as Zombie Kang.
His weapon is the Nunchaku and he has all of his old moves. His skin is a off-grey color and he has chains hanging off of his wrist.
Okay, ready for the disappointing part? You go through hell to beat him. He heals pretty quickly as you fight him. And guess what I got for beating him!?!?!?!
300 F***ing Jade coins. How you unlock him, I don't know. But it was cool to atleast see him.