MIB’s name will be a giveaway
Several people have proposed that MIB is Jack’s son or is some character that we know already while others have refuted it. While I am not sure how I feel about it being someone we already know, I think think by the mere fact we do not know the name of MIB, it means that we will recognize the name and know the character that he is. Obvioulsy that would be giving away too much this early in the season.
A comment – If Jacob is really the evil one that has manipulated all his “victims” and MIB is a good guy just trapped and trying to leave (don’t get the smoke thing tho’), then I will feel as manipulated as Jack, Sawyer, et al.