No mini-kit so far as far as I am aware. The previous ones.... well, they kind of had connections to the combiner. (Shockwave for the scene where Bruticus used him as a weapon, Grimlock for Technobots, Megatron for Devastator and Prime for playing chicken with Motormaster). Eh.... is there another transformer who really fits that bill for the Protectobots? I can't think of one, really.