They stopped supporting MK11 to work on this.

Apparently next game is basically re-release of MK11 with all MK characters from MK9 and MKX added. Unfortunately, the roster itself is one of the sequel's weakest points, should the leaks prove accurate. With Mortal Kombat XI ending on such a high note, it's only natural for fans to expect NetherRealm not to disappoint with Mortal Kombat 12. It also helps that the story from Mortal Kombat IX through XI had some form of continuity, with the ending of Mortal Kombat XI suggesting that everything that had happened in every Mortal Kombat game at that point was canon and part of their reality. After effectively rebooting the franchise with Mortal Kombat IX, NetherRealm has put in a massive effort to expand the roster with each subsequent game. NetherRealm has done a great job injecting new life into the Mortal Kombat series. Mortal Kombat 12 is effectively just a Mortal Kombat 11 re-release The success of Mortal Kombat 11 and the live-action adaptation might have prompted NetherRealm to work on Mortal Kombat 12 over Injustice 3. But, if the recent rumors would have you believe Mortal Kombat 12 is already in development, the roster for the upcoming installment has now apparently leaked online. Having said that, NetherRealm hasn't officially confirmed that it's working on Mortal Kombat XII or Injustice 3. In addition to this, NetherRealm confirmed right around the same time that it had already finished working on Mortal Kombat 11, suggesting that the studio was moving on to its next project.ДЄnother piece of evidence comes by way of the now-infamous Nvidia GeForce Now leak, which gave Mortal Kombat XII an Ap'placeholder' release date. Part of the reason for this is an earlier report from industry insider, Jeff Grubb, where he claimed that NetherRealm Studios is working on Mortal Kombat 12 next as opposed to Injustice 3. If the rumors are true, then Mortal Kombat 12 will release in 2023 with a potential reveal at TGA 2021. However, fans of the popular fighting game franchise are already looking forward to seeing the game announced within the next two years. Mortal Kombat 12 isn't officially in development.

Mortal kombat 11 kombat pack 2