This is pure speculation but what if they have a reveal on day of the dead. Since it seems that we're getting nothing but one character a month it seems that it would fit a reveal day. Or we could get a look at the story finally, and see the return (cameos) of the earthrealm warriors quan chi has control of. I wouldn't mind seeing another new character. Anyways I'm really hoping for reveal soon, but im not holding my breath.
If not Day of the Dead Halloween Friday, wait a few days until Mortal Monday. The beginning of every month since the game was announced, has brought us a new character reveal. September was just a Goro tease with a render, but it was still confirmation of his inclusion in MKX. Next week we should get something.
Quan Chi was already revealed earlier this month. I don't think anything will happen Friday. Halloween would had been the perfect time to reveal someone hideous or someone that can control the dead.