The CW has released new photos from episode 2.17 of "Arrow," which is titled "Birds of Prey" and airs on March 26. You can view the photos in the gallery at SuperHeroHype.
A little bit further down the road, in episode 2.19, we'll get to see more introductions of "The Flash" characters, according to The Hollywood Reporter:
Last fall on Arrow, Grant Gustin was introduced as Barry Allen, the boy who would become The Flash. Now, you'll meet several new faces from the CW spinoff before the season is over. Episode 19 of Arrow, titled "The Man Under the Hood," is penned by the trio behind The Flash — Geoff Johns, Greg Berlanti and Andrew Kreisberg — and will introduce two characters from the spinoff: S.T.A.R. Labs' bioengineering expert Caitlin, played by Danielle Panabaker, and mechanical engineering genius Cisco, played by Carlos Valdes. (Jesse Warren directed the episode.) Arrow executive producer Marc Guggenheim described it as "an important appearance."