Franz Drameh, recognizable to American audiences for his role in Edge of Tomorrow, as joined the cast of the as-yet-untitled Arrow/The Flash sipnoff on The CW. Drameh will play a character named Jay Jackson, a former high school athlete, whose pro-career was derailed by injury. Now making ends meets as an auto mechanic, Jay will come to have a surprising affiliation to the S.T.A.R. Labs crew.
That last bit is interesting, seemingly implying that the spinoff will take place in the same universe and time period as The Flash and Arrow...and that Caitlin, Cisco and company will likely have some role to play on the show.
While not specifically stated, it seems likely that Drameh will take the final lead role which was being cast, known as the "mystery hero." The character was supposed to be a young black man who got super powers in an accident and was the self-aware, snarky voice on the show.
Edge of Tomorrow Actor Franz Drameh Joins the Cast of Arrow/The Flash Spinoff