There is the character list thread up the top, but I'll list the ones I know.
Characters with Confirmed Styles:
Scorpion: Hapkido, Moi Fah, Mugai Ryu
Sub-Zero: Shotokan, Dragon, Kori Blade
Sindel: Zha Chuan, Fu Jow Pai, Kwan Do
Mileena: Ying Yeung, Mian Chuan, Sai
Baraka: Silat, Hung Gar, Blades
Nightwolf: Val Tudu, Tae Kwon Do, Tomahawks
Kenshi: Tai Chi, Judo, Katana
Kobra: Shorin Ryu, Kickboxing, Kali Sticks
Darrius: Shinto Ryu, Leopard, Gauntlets
Dairou: Wing Chun, Escrima, Autumn Dao
Hotaru: Pi Gua, Ba Shan Fa, Naginata
Li Mei: Baji Quan, Lui He Ba Fa, Melon
Bo' Rai Cho: Drunken Fist, Sumo, Jojutsu
Ashrah: Chou Jaio, Ba Gua, Kriss
Ermac: Hua Chuan, Choy Lee Fut, Axe
Kabal: Sun Bin, Goju Ryu, Hookswords
Characters with Unconfirmed Fighting Styles:
Liu Kang: Jun Fan, ?????, ?????
Raiden: Nan Chuan, ?????, ?????
Havik: Snake, ?????, Morning Star
Shujinko: Mantis, ?????, ?????
Jade: ?????, ?????, Staff
Tanya: ?????, ?????, ?????
Kira: Xing Yi (I'm not sure if this is confirmed or not), ?????, Daggers/Raptors (not sure which name will be used, but I heard that the weapons themselves are in real life called Raptors)
Noob-Smoke: ??????????
I'll list what I'd give the characters that are either not confirmed to have three styles (as of yet, and keep in mind I have a very small knowledge of martial arts):
Confirmed Characters:
Liu Kang: Jun Fan, Shaolin Fist, Broadsword
Raiden: Nan Chuan, Aikido, Nunchaku
Havik: Dim Mak, Snake, Morning Star
Shujinko: Mantis, Monkey, Emi Piercers
Jade: Savate, Eagle Claw, Staff
Tanya: Hwa Rang Do, Krabi-Krabong, Yuan Yuang
Kira: Capoeira, Kenpo, Raptors
Noob Saibot: Krav Maga, Ninjitsu, Pudao
Smoke: Xing Yi, Wado Ryu, Moon Axe
