To tell you the truth, I never played the game yet but I saw the videos. It looked really good but I wish I could play it. I don't have a PS3 nor an Xbox 360. However, I have a PSP and I wish they release it in that portable console with the features I have in the following.

Exclusive characters for the MK side:

Jade:
Fatality 1- She uses her Bo to impale the opponent at the stomach area and tosses the victim over her shoulders like in her MKT throw.
Fatality 2- She throws her razorang at the enemy's chest, impaling it there and knocking him/her out in the process. (Similar to Kitana's Fan Toss fatality.)

Mileena:
Fatality 1- She takes off her mask and shows it to the camera first. Next she pulls out a bottle of nails, outs the nails in her mouth, and then spits them out at her opponent, impaling the victim in multiple areas.
Fatality 2- She simply throws her sais at the opponent, impaling each side of the chest area and knocking him/her down in the process. (Similar to Kano's Knife Throw fatality.)

Kung Lao:
Fatality 1- He tosses his hat at the opponent, impaling the victim at the chest. (Similar to my Jade fatality for this game.)
Fatality 2- He pulls out a rabbit from his hat and then the rabbit chews on the opponent's neck. After that the rabbit hops away, leaving the victim on the ground.

Reptile:
Fatality 1- He slashes the opponent to one side of the face with his clawed hand first. Next he does the same thing to the other side of the face with his other hand. And then, he slashes the throat, making the victim hold his/her neck as he/she falls to the floor.
Fatality 2- Reptile his tongue to stick in the opponent's face and drag him/her towards him. Then, he bites off the throat.

Quan Chi:
Fatality 1- He does his own telestomp on the opponent. Then, he does one last heavy stomp with his feet together, making the victim scream in pain. (Similar to Liu Kang's fatality in this game.)
Fatality 2- First, he goes behind his enemy and steps on his/her leg, making the victim squat on his/her knee. Then he twists the neck.

Johnny Cage:
Fatality 1- He does Lex Luthor's torso twist fatality but at the end, he kicks the opponent to the ground.
Fatality 2- Johnny breaks the opponent's neck and then kicks the victim to the ground.

Exclusive characters in the DC side:

Poison Ivy:
Fatality 1- She kisses the opponent at the lips, making him/her fall to the ground to death.
Fatality 2- She uses her vines to wrap around the enemy and breaks the victim's neck in the process.

Zatanna:
Heroic Brutality 1- Zatanna turns her opponent into a bunny and kicks him/her out of the screen like a soccer ball. (LOL)
Heroic Brutality 2- She summons a lot of bunnies to attack her enemy without really killing the victim. (Similar to how Batman summons his bats in this game.)

Martian Manhunter:
Heroic Brutality 1- He turns into his monster form and badly beats up the opponent in any way without killing him/her.
Heroic Brutality 2- He punches the opponent with one hand while floating and uppercuts him/her with the other. Then, Martian Manhunter power punches the victim hard, knocking him/her out.

Aqua Man:
Heroic Brutality1- He summons waves of water at the opponent, drowning him/her first, making the entire screen be under water. Then, he swims towards the enemy and knocks him/her out with a punch. After that, the water goes away and the victim stays unconscious on the ground.
Heroic Brutality 2- Aquaman summons a full pressure of water that knocks out the enemy.

Doomsday:
Fatality 1- He shoots flames out of his mouth to burn the victim to death.
Fatality 2- Doomsday knocks the enemy out to the ground and impales him/her at the stomach.

Bane:
Fatality 1- He carries the opponent over his head and breaks his/her back with his knee.
Fatality 2- He grabs the enemy's leg and slams him/her to the ground multiple times until the victim is dead.

New Fatalities for current characters:

Shao Khan- He swings his hammer, hitting the opponent's face and breaking the neck and then, smashes the hammer on the torso, knocking the victim out. (Similar to his MKSM fatality but only without the chair.)

Darkseid- He carries the opponent over his head and breaks his/her back with it. (Similar to Goro's MK4 bonebreaker.)

Dark Khan- Has each of Shao Khan's and Darkseid's fatalities.

Kano- His Rolling Stomp fatality should be replaced with this: He shoots his Laser Eye Beam but burns the opponent this time.

Wonder Woman- Her heroic brutality of wrapping her lasso around the opponent and spinning them to the ground should definitely go and be replaced with this: Wonder Woman wraps her lasso araound the opponent first. Then she uppercuts him/her. Next, she flies up to the level of the enemy in air and punches him/her to the ground. And after that, she dives down from the air and stomps on the opponent's body at the end.

Basically, I know they are not the best fatality ideas but I was just trying to make it rated T for teen. What do you all think?