The bad news, there will be no new Arrow till March 1st now, Katie from the sounds of it Katie will be in the episode.
OTA VS. NTA — Oliver (Stephen Amell), Diggle (David Ramsey) and Felicity (Emily Bett Rickards) disagree with Dinah (Juliana Harkavy), Curtis (Echo Kellum) and Rene (Rick Gonzalez) on how to handle Black Siren (Katie Cassidy). The two teams face off and a fight ensues.