OFFICIAL Story Spoilers Thread

This is not storyline, but I can tell you the following. Don't read if you want to keep hope. I've obtained some facts looking through hacking through the game's code.

- There are NO other hidden characters beyond unlocking Shao Kahn and Darkseid
- Story Mode cutscenes are all FMV, NOT in-game rendered. So those characters featured are not models available in game.
- The Krypt was planned for the game, and cut at some point
- Batman has an alternate ending featuring a mention of ERMAC
Concerned that other worlds might once again invade Earth, Batman created an autonomous global security system to monitor any temporal breaches. His system, ERMAC (Earthrealm Monitor and Auto-Containment), is designed to detect and trap invaders from alternate universes. OMAC has already discovered a breach in Metropolis
- Shao Kahn and Darkseid are setup in-game as DLC. So that's why they share that RB/R1 menu in the game. The DLC characters will go there too once downloaded to the game. So the game can for sure support it, once the characters are released.
 
Seems to me that the storyline takes place between Mortal Kombat II and Ultimate Mortal Kombat 3 or shortly after Ultimate Mortal Kombat 3
 
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