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Ed Boon loves to be cryptic on Twitter, dropping both hints and red herrings to followers about upcoming events and characters for his Mortal Kombat series. He hinted at Tremor becoming part of the MKX cast long before the game even came out, and has teased about the story mode cast becoming playable as well. 

Now, Boon has done it again, posting a tweet with the question, "Tomorrow?" and a picture of four shadowed figures. On the picture it simply reads "Who's Next?"

Are these four characters the formerly unplayable story mode cast such as Rain and Baraka? Are they four characters—new and old—that will make up Kombat Pack 2? Or is Boon simply messing with his audience again? Only time will tell.