According to The Wrap exclusively, Rutina Wesley (True Blood) will be appearing in season 4 of Arrow for a multi-episode arc.
The report is short on details on whom she would be playing, as there’s no character name or details disclosed in the article. The article also doesn’t touch upon when in season 4 Wesley will be appearing in.
In due time we’ll find out and be sure to report it as soon as the information is available.
Source: The Wrap