If I were you I'd just watch a couple of fights with each of the competitors from the main card like Ristie, Kiria, Mirko, Remy, etc to get a good idea of their fighting style. You'll know what to expect and maybe even find which of them you like most and whom you'd want to root for.
KB: The Doctor, The Savage Samurai.
Box: El Chacal, SOG.
MT: Jom, The Boxing Computer.
MMA: Jr., Showtime.