Suicide Squad: Appearing in the sixteenth episode of the second season with the same name, this squad comprises of Bronze Tiger (Michael Jai White), Shrapnel (Sean Maher), Amanda Waller (Cynthia Addai-Robinson), Deadshot (Michael Rowe), Lyla Michaels (Audrey Marie Anderson) and Diggle (David Ramsay).
Birds Of Prey: It seems that Oliver's love life will continue to be complicated as Helena Bertinelli/Huntress (Jessica De Gouw) returns and there seems to be something of an instant clash between her and Sara Lance/The Canary (Caity Lotz). I do like both characters and with Sara willingly making herself a target for Slade in order to help Oliver, it will be interesting to see if Helena is either ally or enemy when she reappears in episode seventeen of this season.
Deathstroke: Manu Bennett's Slade Wilson/Deathstroke has been designed as the main villain for this season for quite some time and going by this three minute trailer, he's certainly going out of his way to make Oliver suffer by targeting the latter's family, friends and allies all at once. It's nice that Deathstroke is making more of an effort to directly strike out at Oliver and going by this trailer alone, it does look like anyone could suffer as a result of Slade's growing vendetta towards Oliver as well.
Full Circle Trailer: http://www.youtube.com/watch?v=uEZQUcjG6AY
Arrow continues to air Wednesdays 8pm on the CW and Thursdays 8pm on Sky1.