I think they are going to have Jennifer be the younger Emma, at least i really hope so, so i would think that the same actor that plays the adult present day Bae will most likely play the slightly younger Bae, assuming that he is Henry’s father.
Yep, Jennifer is playing her younger self since it’s only 10yrs ago (much like Regina played her 18yr younger self), so we should see Henry’s father as he is now.