My first thought was Abraham because of the way he "stood up" on his knees and looked Negan in the eye, and he kind of showed himself as a no fear, strong guy and Negan would want him out. Abraham has also been so positive and looking toward the future lately and that doesn't usually end well. On Facebook last week I also posted to some friends they seemed to be setting it up as Abraham. With that being said, Talking Dead says the one killed will greatly affect the group in a very big way, which makes me think Maggie or Glenn, or maybe Sasha and Abraham goes nuts. People are saying it has to be a guy but I didn't get that feeling. People ask why not Rick but I think it couldn't be for obvious reasons, but also when Negan found out Carl was Rick, the leaders, son he knew he'd always have something to hold over his head, like Rick do this or Carl gets it.
Honestly, I don't even like that there's a comic, I wish it was a totally new and independent story. I'm going to still say it was Abraham. It better not be Daryl!