In addition to the casting of Captain Cold, it's become known that a big event is being planned between the two series, and fanboys that aren't too happy with the look of Grant Gustin should welcome the following news.
At the Television Critics Summer press tour, it was said by executive producer Greg Berlanti that the team working on The Flash costume is "evolving the suit over time" with it stated to "become more vibrant and red" as the series progresses.
Regarding the big event between Arrow and The Flash, it's reported there will be a two-hour crossover event.
"Episodes 8 of both shows,¬†Arrow¬†and¬†Flash, are going to be a two-hour crossover event," Andrew¬†Kreisberg¬†told reporters. "[Also], in Episode 4, Felicity is going to come to¬†The Flash."
Expect even more details at next week's Comic-Con as Stephen Amell is set to host the 3-hour WB TV panel.
The Flash premiers Tuesday, October 7th at 8pm ET; Arrow Season 3 debuts Wednesday, October 8th at 8pm ET.