There is new DLC for Mortal Kombat X that heralds the return of Tremor and the Black Dragon ninja. This will be the first time that Tremor will be fully playable and you will also get the Klassic Skins Pack 2 with your purchase that will include new skins for Jax, Kung Lao, and Quan Chi.
Also available, for free, is the Klassic Fatalities Pack with fatalities for Jax, Kung Lao, Mileena, and Kitana. Downloadable on Steam and the Xbox Marketplace on July 21st and the Playstation Network on the 22nd. So if you are of the old school and want to go Klassic or if you want to change it up from your typical skin and fatalities check it out on your console's store or on Steam.