This one has two predictions but one is more plausible than the other
1) The body on the road that Russel is walking down looks alot like Carleys (the body appeares to be wearing a hoody). Also the road itself looks the same.
2) Could the corn field that Bonnie is running through be the St Johns dairy's. Though it could just be any corn field, it may show what happened to the bandits or any of the St Johns you kept alive.
Both of these can be backed by the fact that telltale did say that echoes of what you did in season 1 will be shown in the dlc