It would appear that Ed Boon, Executive Producer on Mortal Kombat, has accidentally revealed that work is already underway on the next Mortal Kombat title.
A follower asked him if it would be possible to get story based DLC to which he replied;
RT@OfficialRafaRIOIs it possible Story Mode DLC chapters 4 the 4 DLC Noobde: Possible? Yes. Probable? No. Story guys working on next game.
He was also asked if the next game would be based off Mortal Kombat 4 to which he replied;
“We changed the timeline so probably not.