It has sadly been announced that Mortal Kombat X for the previous generation (Xbox 360 & PS3) of consoles has been cancelled. In a statement posted by a community admin Yorik at WB Games they have announced that the development has been cancelled due to the title not meeting the quality standards of the current-gen:
After months of development, Warner Bros. Interactive Entertainment has come to the regrettable conclusion that we cannot release Mortal Kombat X for PlayStation 3 and Xbox 360. Please know our teams worked diligently to meet the quality standards set by the current-gen versions of the game. We were not able to get the PS3 and Xbox 360 versions to the quality expected of a Mortal Kombat game and are very sorry for not being able to deliver the products as originally planned.
If you pre-ordered Mortal Kombat X for PS3 or Xbox 360, please go to the retail location where you pre-ordered the game and you will receive a full refund.
It's always sad to hear the news that games aren't going to be released and I'm sure there are a going to be a few disappointed fans out there who were looking forward to the release.
Source: WB GAMES