SnakeDoctor
Super Freak
Before the show aired I thought Glenn would be the victim because he has had so many close calls this season and his death is the most expected because of the comic. Now that they have made it a cliff hanger, I think it will be Abraham. He has had a lot of air time recently and it seems like his story arc has come full circle. I think the cliff hanger makes it easier for TWD to justify keeping Glenn around to the audience after teasing it for most of the season.
Abe, Daryl and Glenn are the big three.
Apparently, Kirkman has said he regretted killing off Abraham, the only real soldier, before the Negan war in the comics. Since he was due for the arrow that got Dr. Whatshername, I think he may not be the guy.
I'm guessing Glenn. They look like they're setting up Daryl and Dwight for a showdown.
SnakeDoc