This is gonna be one hell of a season, so much angst!
I haven't started reading the books yet so I don't know what happens in Nemesis Games, but I know, based on context clues from book fans that this is gonna be some heavy emotional shit, particularly in regards to Naomi and her storyline with Marco Inaros and her son, and we're going to be getting more Amos backstory, definitely taken from the novella, The Churn. Otherwise, I know nothing else and that makes me excited because this trailer has me so hyped! Seeing their faces again, Drummer and Bobbie and Avasarala and Fred Johnson, it makes me so, so, happy!
(Also worth noting that it seems that the trailer did lessen the appearance of Alex, considering what happened earlier with the reveal of the actor being not a good person, and while I haven't heard any news in regards to what they're planning on doing about I'm at least hoping that it doesn't lessen seeing Bobbie's face because it seems like she is sharing a lot of her scenes with Alex this season.)
Overall, it's nice to have something to look forward to in this shitstorm of a year.