I think a fascinating track would be if they were to show Chandragupta's marriage to Selucus' daughter, and a bit of their married life as well. It would be interesting to see how a Macedonian woman of that time would embrace a husband and culture totally alien to her. This would be pretty different from today, where it'd be no big deal, and all that is needed is some comprehension by both spouses of each others' cultures, but in the above case, this Macedonian princess would have to get used to a whole new slew of language, customs, rituals, et al.
I have no idea whether that's known, or whether they plan to show that, but if they did, it would be really interesting to watch.