Now the question remains:
Is Cyber-Sub:
1. A "What if" character? Is he what would have happened if Younger Sub was caught instead of Smoke?
2. The re-animation of the Older Sub's body after Scorpion killed him? Take a careful look at Noob's and Cyber Sub's masks... they're almost identical...
3. Another of the Sub-Zero kin that we never knew about?
Obviously I don't know for SURE but I highly doubt it's the 2nd theory as that Elder Sub-Zero had already turned into Noob after Scorpion killed him it would make no sense for him to suddenly come back as a machine. I know it's MK and all but that's my opinion.
Now, theory one is more likely and they've even hinted(the MK team) at some one this time may become a cyber ninja who wasn't before but they also said that depending on how he's received in one of those leaks, will determine if the MK team uses cyber sub in future MK games or not...I'm pretty certain, most fans want the normal Sub-Zero that we all have known and love over cyber so far.
Your 3rd theory I was also thinking about the other day, that would be really cool if there were 3 brothers one lost that both Bi Yan and Kuai Lian(Elder Sub/Noob and Younger Sub-Zero) didn't know about and he was also apart of the Lin Kuei and became automated. I honestly am hoping that THIS is the deal with his story. Or it's #1 what if Sub-Zero was caught.
@Jago, that's also a great theory I can see that....they took Sub's(one of them) DNA and attempted to clone/use it on another Lin Kuei Warrior making a cybernetic cyromancer ninja on their own? I can see that....
I just don't believe it's the original Elder Sub-Zero, the only way I honestly see that is if they took his dead body after Scorpion killed him and some how "reanimated him" back to life via automation some how, and when he died his "spirit" was reborn in netherrealm as Noob-Saibot, but to me that makes no sense in a way.