This is all we will get to know about the Island
I just watched 6×09 “Ab Aeterno”. We now know approximately what Jacob and MIB/Smokey/Flocke want and something about the function of the Island. I guess none of it came as a huge surprise to those of us who have followed the series.
My theory is that we will never ever really get to know anything more substantial about Jacob, MIB and the Island.