Warning: Spoilers for the mid-season finale of "Arrow":

Last night was Grant Gustin's second episode of "Arrow" as DC comic favorite Barry Allen. At the conclusion of the episode, we saw the incident that not only gave Barry his powers (in the comics at least) but will also likely lead us into the proposed spin-off of "The Flash" some time next year. Speaking with CBR, Gustin talked about what he's excited about doing in the upcoming pilot saying:

"I'm mostly looking forward to getting the pilot script and seeing how Barry's going to handle this happening to him. He's not just excited. It's scary. That's what I loved about the character in the audition process -- it's not just he loves superheroes, and he's a fanboy, and all of a sudden he's like, "I'm going to be one, I'm really stoked about it." It's kind of like, "This is terrifying. This is really happening to me." I'm really excited to play more of that."

The pilot is expected to go into production some time next year with a script from "Arrow" co-creators Greg Berlanti and Andrew Kreisberg and DC Chief Creative Officer Geoff Johns. Kreisberg and Johns also talked about the upcoming spin-off, noting the difference between the two shows.

"We'll want to keep 'Arrow' as distinctive as possible and "Flash" as distinctive as possible," Kreisberg said, "Part of the fun will be how those two things play out in both shows, if we get that opportunity."

Johns added, "But there are story reasons that Flash feels different and that he's taking on different things in his series."

The new season of "Arrow" has introduced a number of classic DC characters into the mix, will "The Flash" take a similar route? Kreiseberg thinks it will, and will likely try and use more 'fantastical characters.'

"In the same way that "Arrow" was conducive to bringing on characters like Deadshot and the Huntress and some of the more grounded people, hopefully with "The Flash" there's a way to bring on some of the more fantastical characters, that will probably still go through the grounding lens with which we view everything. But we could tackle some of the bigger villains, and possibly heroes. There's a hint of a major character in the pilot."

"But it's always important to remember -- like with "Arrow," everybody wants Batman to come on and whatnot, but Arrow has to be the coolest person on "Arrow." The same thing with "The Flash" -- Barry has to be the coolest person. If we're lucky enough to get to do more past the pilot, it'll really be about making sure that the audience loves The Flash, and Barry Allen, and Grant Gustin, as much as we do."

"Arrow" pilot director David Nutter will helm the upcoming pilot for "The Flash."

Here's a new Grant Gustin interview video that The CW released today as well:
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Two more actors have been added to "The Flash" pilot in development at The CW, according to Deadline: Rick Cosnett as Detective Eddie Thawne, and Danielle Panabaker as Caitlin Snow.

Both of those character names have significance to fans of the DC Comics source material. "Eddie Thawne" appears to be the show's take on "Eobard Thawne," Barry Allen's archrival Professor Zoom. "Caitlin Snow" is the latest version of DC villain Killer Frost, who debuted in the "Killer Frost" one-shot as part of Sept. 2013's "Villains Month."

Deadline describes Eddie Thawne as, "a recent transfer to the Central City Police Department, whose past is a mystery and who harbors a dark secret;" and Caitlin Snow as, "a highly intelligent bioengineering expert who lost her fiancé during an explosion at S.T.A.R. Labs."

"We're using a lot of mythology, a lot of characters from the comics in the development of the 'Flash' show," DC Entertainment chief creative officer and former "Flash" comic book writer Geoff Johns said in December. "I don't want to get too specific yet, but you'll see a lot of characters, a lot of elements from that. It's very much 'The Flash.'"

Cosnett has recently been seen on another CW program, "The Vampire Diaries," as Dr. Wes Maxfield. Panabaker has appeared on "Necessary Roughness" and "Bones." The two join Grant Gustin, who debuted in the title role of Barry Allen/The Flash in two episodes of "Arrow" last month, and Jesse L. Martin, announced earlier this week as playing "Detective West."

"The Flash" pilot, in contention for a spot next season on The CW, was written by Johns and "Arrow" executive producer Greg Berlanti and Andrew Kreisberg. David Nutter, known for an impressive track record with successful pilots (including "Arrow"), will direct.