negan will be a character not revealed yet...but to come in the next episode...more evil then the governor
https://en.wikipedia.org/wiki/Negan
who will die...glenn for sure ( spoiler alert)
anyway ...the big mistake that the group make'it now...is that they turn from defensive to offensive..thinking that negan will be an easy target since they managed to get rid of all the enemies until now...but it will me a hard reality check for the group