Well, Khemia takes place about 2.5 years after the end of Adastra and Marco's mission on Earth is suppose to take about 8 years, so we are not likely to see them get together in Khemia.
However, since Amicus is getting updates of what is happening on Earth it begs the question of how? If they have some ship hidden around Earth it can access the internet and get news and return it back to Adastra on a regular basis. Or maybe the Parents are providing the info?
Either way, Amicus and Marco might be able to send messages (text or video) to each other through Marco's portal/tablet but probably not in real time. I think that is the best we can hope for right now.