I'm talking about the epilogue. I highly doubt it's Christa and Omid honestly. Think about it. Several times the option of "Give Clementine to someone safe" appeared as on of the four choices. Why would Lee even think such a thing if that was not the case right? Of course, you could also tell Clem "not to trust anyone ever" where he mentions he isn't sure of how trustworthy Omid and Christa are but I doubt she would listen to that. But there's more.
Christa and Omid have proven that they don't really like Lee. If you don't show the bite and did not leave Clem in the house with a gun they reveal that they don't trust you. Also, she doesn't want a family as evidenced by how she drank a lot of the wiskey and did not like the idea of parenting Clem. To top that all off, they thought meeting up with Lee and Clem at the Marsh House was a stupid idea. My guess is that because they are on their own again, it gave them the time to think of their choices. They probably felt thought that Lee may turn into a walker and kill both the kidnapper and Clementine. Not willing to take chances, they left to the countryside. A DIFFERENT countryside. The two people shown looked like men and both looked about the same height. One of them looked fat. (This could be Christa with her baby bump starting to show though). If it was the same two characters, that would be great but Telltale always pulls the unexpected and they may be Omid and Christa after all.