So, if I get it right, the Romulan guys want to kill the Synths and possibly Picard in revenge because the Synths destroyed the rescue ships.
The rogue scientist Maddox used Data’s neural net to create at least two advanced androids who are flesh and blood and are programmed to believe they are human. Dahj is now dead and her sister Soji is working and getting romantic with Narek, a Romulan who is probably some sort of spy for the Romulans who want to kill Synths and have been using Borg technology. Narek somehow knows Soji is Synthetic but she doesn’t know what she is. The Romulans call her the Destroyer. It wasn’t explained just why the Synths attacked Mars, so the Romulans might have a point. The robots are possibly vulnerable to tampering and being turned to anyone’s purpose. Maybe some scientist at Daystrom didn’t want to save the Romulans.
Picard’s two Romulan friends/employees are the former Romulan agents whom he encountered when his last ship tried to evacuate a Romulan colony and there was a disagreement over whether to also save the native inhabitants whom the Romulans viewed as inferior, per the graphic novel. Raffi, whom Picard is seen talking with in the previews, is Picard’s former first officer on that ship. Agnes the robot scientist will also be joining Picard’s quest. Seven is involved in some sort of group that advocates for former Borg/synths and, as Seven is seen crying, one of them will probably be killed. Riker, who looks pretty scruffy and out of shape, and Deanna Troi retired somewhere and have a teenage daughter called Kestra after Deanna’s sister. I doubt they will be regulars. Some of Picard’s other cast members have yet to be introduced.
I like the actress playing Dahj/Soji. I hope they don’t kill off Soji too. I also prefer the Romulans with long hair over the hideous, identical bowl cuts and ugly forehead ridges from past series.