The expectations of Arrow Season 4 Episode 18?
To discover who is going to land in that grave.
It sure seems that way, as someone is pronounced dead at the title of the installment, 11:59.
In addition, the promo touts the end of an era.
If you recall, at the beginning of the season, there was a specific scene showing Felicity, Diggle and Oliver sitting down to toast the Original Team Arrow.
Is that the end of the era? Will a death ensure that team can never reunite, even if Miss Felicity decides to rejoin the team?
If so, then that places John Diggle a lot higher on the list.