UPDATE: 2:35 PM with sizzle reel (see it above).

It might have been a side effect of the almost symbiotic relationship between the show’s devoted fans and its creators, but today’s WonderCon panel devoted to CW’s The Flash felt like a rushing torrent of near-reveals and tantalizing hints. New characters were hinted at, major developments were teased, and the transformation of one of the show’s central characters was all but officially confirmed.

Kicking things off was a trailer for the final episodes of the current season. Differing from the teaser released earlier this week, it was heavy on appearances by new characters and glimpses of further crossovers with CWs other superheroic hit series Arrow. Among the highlights, Brandon Routh‘s Ray Palmer/A.T.O.M., the as-yet underused Gorilla Grodd, and a genderswapped version of DC supervillain Bug Eyed Bandit.

Following the trailer, a panel discussion attended by The Flash co-creator and co-executive producer Andrew Kreisberg, joined by cast members Carlos Valdes (Cisco Ramon), Candice Patton (Iris West), and Danielle Panabaker (Caitlin Snow). The sincere camaraderie felt by the cast was apparent as they discussed topics like Valdes’ improvisational skills, their favorite moments acting together, and how, upon seeing the reactions on Twitter as the pilot episode aired, they knew they had a hit show.

Aside from the heartwarming interplay, the panel was notable for the sheer volume of hints and outright spoilers. The biggest: Panabaker confirmed that her character will transform into the antihero and occasional tragic villain Killer Frost, possibly by the end of the current season.

“You’re gonna see her sooner than you think,” Panabaker said, later adding that her character’s arc for the remainder of the season could be summed up with the word “frosty.”

It was also revealed that the events of episode 15 (which aired March 17), erased thanks to The Flash accidentally traveling backward in time, will reappear in some form before the current season ends.

As for season 2, Kreisberg was a little less circumspect than at PaleyFest two weeks back. Teasing that “we’ve got one thing that hopefully, people will lose their minds for,” he discussed in broad strokes that the show’s characters will get glimpses into alternate timelines, further stoking speculation that the intent is to adapt DC Comic’s Flashpoint Crisis in some fashion.

He also said the show intends to add classic The Flash villains Mirror Master and Dr. Alchemy to its rogues gallery, and once again hinted that the show plans to introduce Wally West, in the comics a protege and eventual successor to Barry Allen, at some point.

On a final, humorous note, a lingering continuity issue that has bedeviled fans of The Flash sister show Arrow was also cleared up during the panel. Asked during the fan Q&A segment why the name of villain Ra’s al Ghul is sometimes pronounced as “rahs”, while other times as “Raysh”, Kreisberg confirmed this was intentional.

“Most of us comic-book fans, we call him ‘Raysh’, not ‘Rahs'” he told the crowd.  But, he said, director Christopher Nolan‘s decision to pronounce the name as “Rahs” in Batman Begins led to confusion among casual fans. Therefore, “what we decided is that if you’re [allied with the character], you call him ‘Raysh’, and if not, you call him ‘Rahs.'”

The Flash will be taking a one-week break this week. The final slate of Season 1 episodes will begin with “All Star Team Up” on April 14.