The latest character will be revealed tonight during a dev-hosted livestream.
The below teaser video, with just the sounds of a fatality, uploaded yesterday gives some clues to who the character may be. But, if you can decipher the sound-only, super-liquid-sounding 'clues', you're a better person than I.
So far this week the latest character for Mortal Kombat X was revealed to be Reptile - the acid-spitting, lizard-tongued... well, reptile, man-thing.
Mortal Kombat X is due for release on 14 April for PS3, PS4, Xbox 360, Xbox One, and PC.