I can't believe it's been this long since someone's posted in here! I'm going to be discussing Season 6 spoilers, so don't get shitty with me.
So, it ended with Negan killing someone from their POV and I think I've figured it out. In the comics, Negan kills Glenn and I think this will be one of the few deaths the show keeps the same (so far only 3 deaths have been the same as the comics)
If you watch this scene you see the victim's pre-bashing POV. The producers have said the start of season 7 will explain that character's POV and the hours leading up to their murder. The four people in the van are Glenn, Daryl, Rosita and Michonne. Negan doesn't kill women or children in the comics and I don't think that's something the show will change since that's a huge part of who Negan is. That leaves just Daryl and Glenn. BUT when Dwight is opening the door, you can clearly see Daryl's head and hand - leaving the only option to be Glenn. Plus, with the positions Michonne and Rosita are in when they're leaving the van it wouldn't make sense for them to have the view of Daryl.
I was hoping they'd kill off Daryl because at this point I think it would be emotionally necessary for the fans to understand how much they're supposed to hate Negan. The person he kills is supposed to break you to your core. It has to be someone who's been there from the start. It has to be someone loved by everyone. But, with Glenn's dumpster diving escape this season it almost makes too much sense for it to be him. Plus, in order for certain things to happen with Maggie in the future, Glenn needs to die. It's a bit disappointing this seems to be taking the comic route, but either way, the start of season 7 will be heartbreaking.