Speaking with Geoff Keighley during a Summer Game Fest Q&A, Ed Boon revealed that NetherRealm Studios are working on other projects not related to Mortal Kombat or Injustice.
Mortal Kombat has become like a staple thing, almost Marvel-like. You don’t expect the last Marvel movie to ever come out, they’re just gonna keep coming. Even though we’ve been able to scratch other itches, you know doing injustice games and stuff, and we have other stuff in the oven, but it’s always nice to do the Mortal Kombat games. Especially when the players have been embracing them as they have. If you would have told me that this would be our, so far fastest-selling Mortal Kombat games of all of them, 20 something years later, I wouldn’t have believed it. The fact that they’re doing as well as they ever have is great.