Producer Greg Berlanti told Huffington Post that the series will debut in September and that there would be at least two gay characters.
Berlanti revealed that gay DC Comics character David Singh (played by actor Patrick Sabongui), will be a recurring role throughout the first season of the show.
He also announced another gay character, whose identity is not yet known, will appear during the season. The second character will also be be a guy who already exists in the DC universe.
Wentworth Miller has also joined the show, and will play Flash nemesis Leonard Snart aka Captain Cold.
The show is set to enjoy extensive crossovers with sister show Arrow, which itself introduced a lesbian relationship between Sara Lance (Caity Lotz), and assassin Nyssa Al Ghul (Katrina Law).
Here is a sneak peek of the new show