Ok I just watched the other season 7 sneak peek (the one where Rick threatens Negan) and Negan mentions killing Rick's "right hand man" so I'm thinking its a guy that's killed. Rick also has blood on his face, so it was probably someone in close proximity to him.
I guess I won't be making a poll, so who is everyone's guess as to who is killed? I think the writers want us to think it's Daryl, that's why the blanket is there. I know Rick will probably get his hand chopped off.