I think Abraham gets killed.
Abe gets my vote and maybe even a second...Glen.
The fact that he clubbed him and he got up, proves it wasn't many of them. It's not Carl or anyone close to Rick as he wasn't frantic during the new trailer preview that was shown.
I think we're going to get surprised. I think it's Abraham and Glenn. I think the one who meets Lucille first is Abraham. Glenn then jumps in to stop Negan. Glenn then meets his fate. Daryl also jumps in, but is spared and held as prisoner.
Saw this after I posted, but I agree.