Thanks to PF108 for the following.
Sunday 12/15 Filming report:
So in the alt reality, Jin and Sun and Sayid meet up with Keamy and Omar at the same location (a golf course) Sayid originally met K and O. Also, as we know, Mikhial is involved with K and O and seems to be the one calling the shots.
Because K, O and M all were bad guys who died on the Island, I have a sneaking suspision that they are the agents of MIB in the alt reality.