I was thinkng about the story and I think I came up with something.
1)Notice on the latest stream there are 26 spots and not 24 as before (That might not be final)
Source:
https://www.youtube.com/watch?v=UHCIVkFHlKA
2)Ed Boon said that they might be playable bosses as long as they're not like Montaro
Source:
TRMK: In MK9 the boss characters were not playable, will the same be said of this game or is that still up in the air?
Ed Boon: I guess can only speak for myself but I definitely want the bosses to be playable in some way. Like "you unlock them when you do this". We don't have Motaro in the game but if had the big centaur half horse guy that filled half the screen it would not work. I don't think people think it through and just say "I want to play as Motaro!" You really don't!
3)Now, we know that this MK story goes through 25 years. In the NR war the main antagonist is Shinnok, In the Outworld civil war the main antagonist could be somebody else.
4)They are going to be unlockable characters in the game (Above source)
5)That makes perfect sence when in an interview at E3 Ed boon (not directly) said that the roster is going to be between 30-32 characters.
Source:
https://www.youtube.com/watch?v=tBewbWdltMA
I believe that as you play through the game you unlock more that 1 character. For example after passing the NR war you unlock Shinnok and after passing throuth the Outworld Civil War you unlock Reiko (These are used only as Exmple)
That would make perfect sense on why NRS don't reveal any post MK4 characters as many things are tightly linked to the the story. Do you agree???