Why he might be dead: He was one of the biggest focal points of the final scene, with Negan taunting him about his giant failure of a plan as he strutted around the camp. Thanks to the Comic-Con footage, though, we know for sure that he definitely lives!
Why he might not be dead: As stated above, he's alive (even if he ends up losing a hand in the process). The ensuing power struggle between Rick and Negan after the villain kills one of Rick's group goes on throughout much of the comic books, so it makes sense that the show's creators wanted to keep to the original source material. As well as proving Rick lives, the season seven scene also makes it clear that whoever died was likely on Rick's right side, since that side of his face is splattered in someone else's blood.