In the new season, it says that many months have gone by. This probably means an upwards of 10 or 12. By this time Christa would have had Omid's child. There is a high possibility that we will see them, whether if they are dead or alive is unknown.
I had an awesome thought that will most likely be not real and super far fetched. However what if Clementine finds Omid and Christa, and if/when they die they already had a baby. What if Clem had to protect that baby? I dunno, just a thought, what do you think?