Mortal Kombat X is likely to have guest characters, much like NetherRealm's previous two fighting games, Injustice: Gods Among Us and Mortal Kombat (colloquially referred to as Mortal Kombat 9) - but there won't be any superheroes from DC Comics.
Speaking with Polygon, Mortal Kombat co-creator Ed Boon said that the guest characters in Mortal Kombat 9 and Injustice had both been very successful.
"Freddy Krueger was the most downloaded character in Mortal Kombat 9," Boon said. "Scorpion was the guest character in Injustice, and he was the most downloaded character in that game. It's working out for us, and I'd be surprised if we ignored those numbers."
However, he confirmed that if Mortal Kombat X does get any guest characters, DC superheroes won't be among them.
"I'd be hard-pressed to have a DC character as a downloadable character in Mortal Kombat X," Boon said. "The main reason is, I have no desire to cut Batman's head off. I have no desire to kill Superman."
However, Boon did also say that a sequel to Injustice was something the studio was interested in. "Injustice did really well for us, so I would hope that maybe someday we will do another one," he explained. "There are certain things that I feel are signature to that game... From my perspective, there's the Mortal Kombat universe, where you can do the extreme violence. The Injustice universe is superheroes and more over-the-top stuff as opposed to blood and gore."