Predator will be added to Mortal Kombat X "soon", according to Game Director Ed Boon, who revealed the character via Twitter. The image below shows the Predator along with the fighter Jax (decked out in a costume that's suggestive of Carl Weathers's character in the original flick).
The confirmation from Boon was picked up by EventHubs, who dug deep in the game's database, and found notes of other Predator-themed costumes, and the three fighting styles of the new character. They're called Warrior, Hunter and Hish-Qu-Ten.
If you're still considering a purchase of Mortal Kombat X, check out our review.