"Arrow" co-creators Greg Berlanti and Andrew Kreisberg and DC Chief Creative Officer Geoff Johns are writing the episodes, which they shared will be an origin story of The Flash. Which incarnation of The Flash? The creative team decided that Barry Allen would be the best fit for the show.
Andrew Kreisberg remarked that, "The character will be as grounded and realistic as possible...That’s how we’ll get to know him. Then his life will get a bit faster.”
Berlanti added, “That said, he does need powers to become The Flash. And he will be The Flash. He will wear a red costume, and he will go by that name.”
Later, a question was asked on the creative team's choice in selecting The Flash over other Justice League superhero characters. Andrew Kreisberg responded that the character was Berlanti’s favorite character when he was growing up and that "there’s something very relatable about Barry.”
Apparently, the introduction of the character will lead to a stand-alone series. Fans of "Arrow" will be happy to know that the same creative team behind "Arrow" will be behind the new TV series. Berlanti noted that, "we think it [The Flash] fits well both in terms of 'Arrow' and as a stand-alone series.”
Combined with the result announcement of the Superman & Batman movie at this year's Comic-Con, it looks like WB is getting ready to pair up their superheroes and lay the groundwork for a cinematic Justice League movie.