Yesterday the synopsis for Arrow's seventeenth episode for this season was released.
“THE BREAKING POINT — Prometheus (Josh Segarra) goes to great lengths to break Oliver (Stephen Amell). Meanwhile, in the flashbacks, Anatoly (guest star David Nykl) becomes worried about Oliver’s increasingly violent tendencies, which come to a head in a brutal confrontation. Kevin Tancharoen directed the episode written by Brian Ford Sullivan & Emilio Ortega Aldrich (#517). Original airdate 3/22/2017.”
The title of the episode Kapiushon loosely translates from Russian to "Hood or Cowl". With this synopsis and title it seems that this is when we will see Oliver in the flashbacks fully transform himself into the Hood. If you remember back in Season 1 Oliver's character was referred to as "The Hood". It wasn't until Season 2 that his character went by "The Arrow".