At the Flash panel at Wondercon this weekend, one of the big reveals was by actress Danielle Panabaker who not only confirmed that her character of Caitlin Snow will become her comic book alter ego Killer Frost, but that it happen as soon as the end of this season.
It was also revealed that some of the events from episode 15 that were then erased by The Flash's time travel would reappear shortly… which may be bad news for another panel member Carlos Valdes (Cisco Ramon) or it could be romantic news for panel member Candice Patton (Iris West).
Executive Producer Andrew Kreisberg got in on the spoilers as well telling attendees that they plan to introduce the classic villains Mirror Master and Doctor Alchemy and that plan for Wally West are being talked about. He also said that characters will get a glimpse into alternate timelines leading to more speculation that the show is heading towards the comic storyline Flashpoint.
And finally, answering an Arrow question, Kreisberg explained the different ways of saying Ra's al Ghul. They said it was an intentional decision to use the two different pronunciations because of how it was meant to be said and how Christopher Nolan decided to say it in the Batman film trilogy. It breaks down by allegiance. If you side with him then you say Raysh, while those who oppose him say Rahz.