Though Manu Bennett was very critical of how Slade Wilson aka Deathstroke was portrayed on Arrow, he ultimately remains good friends with most of the cast and has stated that he would love to return to the show for the right storyline. However, according to Marc Guggenheim, Deathstroke is tied up on another DC project. Is it likely that Deathstroke will soon be appearing the DC Cinematic Universe? Here's the question asked by a fan and Guggenheim's answer.
Q: Any possible chance of either Slade or Walter returning throughout the rest of Season 4? #Arrow
Guggenheim: The character of Slade Wilson is currently tied up in another DC project. Walter is more likely.
There's lots of rumors and speculation on Scott Eastwood's role in Suicide Squad, that he's essentially not just a random government soldier but a mole planted to spy for Batman or Amanda Waller. Could he ultimately turn out to be Deathstroke?