Too Predictable: Shinnok IS The Final Boss!
Mortal Kombat X is Mortal Kombat 4's events repeated in the next life. For some reason, we don't see the reincarnations of Cyrax, Baraka, Reiko, Jarek, Tanya, Kai and Fujin as playable characters. However we do see Reiko in the comics, having some bizarre relationship of convenience with Mileena. Now if you look at this video... you'll notice something different about Shinnok!
So what challenge am I expecting? So after you defeat normal, playable Shinnok (most likely DLC), I think Corrupted Shinnok won't be a playable character due to imbalance. It's like in Tekken 3... I mean do you remember the time you beat Ogre? Ogre after you beat him one round, he becomes True Ogre in the next round or in Tekken Tag Tournament 2, Jun Kazama becomes Unknown. In here, Shinnok becomes Corrupted Shinnok.
Woah, Corrupted Shinnok looks like a badass combination of Soul Calibur's two infamous bosses Inferno and Abyss. He takes on this really badass form that would look very hard to defeat. I would guess this is the Shinnok we have been waiting for, badass and totally EVIIIIILLLLLL. Just imagine Journey to the West's version of Yan Wang or Mara getting the respect he deserves!