So the theory is that N killed Nori.
This may seem already established as a theory, but something about the trailer solidified this.
I'm thinking that Nori was N's first kill (or at least, one of his firsts), cause when Khan mentions him having to put Nori out of her misery in ep. 1, It might have suggested that N probably stabbed her with the nanic acid and ran. It wasn't until J and V convinced him to actually finish his victims off that he committed to the kill.
But where does this connect to Ep 7-8? Well, my theory is that Uzi discovers that in the next episodes and goes into a blind rage, which would explain the scene from the trailer when she crushes N's hand. Now, most people would naturally assume that this was Cyn's doing. But if you look at the back of her hand, it's still purple, which means she is still in complete control.
Now this could go one of two ways:
1. N and Uzi have an epic fight scene and realize that this isn't worth fighting over. This explains the scene where she hugs N and cries
2. She kills N and goes back to being a loner that must kill worker drones to survive
Now, honestly, The second one would be bleak. But it would end the show in a manner that would sum up and finish the season.