NYCC 2010 revealed that Oliver Queen gets a nemesis in Black Arrow…..
[Writer J.T.] Krul said “Green Arrow” would soon see the resolution of the Queen storyarc, then move into “Who is Black Arrow?” “Green Arrow’s needed a nemesis for a while, and this will set that up,” Krul said.
Blue Beetle / Booster Gold have the Black Beetle and the New Guardians / Green Lanterns have the Black Lanterns, so Green Arrow needs a Black Arrow. BUT, is this new Arrow Blackest Night related?