Season 3 of Arrow threw Stephen Amell's Oliver Queen/Arrow - who is confirmed to finally become Green Arrow in the next season - and his allies into a dark and emotional conflict. A friendship was shattered, a loved one was lost (for now, that is...), and an ally was forced to flee, but still, there was light at the end of the tunnel. Now that Ra's al Ghul is out of the picture, Oliver and Felicity Smoak (Emily Bett Rickards) have finally decided to get together and the season concluded with them taking a much needed break from Starling City - which will soon become Star City - and the vigilante lifestyle.
Executive producer Marc Guggenheim has assured fans that the next season of Arrow will have a lighter tone. Now, he's teasing the presence of a hero who can light up an entire room: Green Lantern. Throughout Arrow and the spinoff show The Flash, there have been a couple of noticeable Green Lantern Easter Eggs. From Ferris Air to a remark about a pilot vanishing - which is a blunt Hal Jordan reference - The CW's DC universe has certainly teased fans that Green Lantern exists.
As the release of the first Arrow Season 4 trailer approaches, Guggenheim attempted to get fans even more excited for the new season by posting production art - art which also happens to be a huge tease for fans of the DC universe and its heroes. As you can see below, the image is of Coast City, which is where Hal Jordan - the most well-known Green Lantern - hails from. As if that wasn't a strong enough reference, the image also says, "In brightest day, in blackest night, come to Coast City, when money's tight." Obviously, that's a nod to Green Lantern's oath.
As stated above, the existence of Coast City in the CW-verse shouldn't come as a surprise since both Carol Ferris and Green Lantern have been blatantly teased in both shows, and the city itself has been mentioned multiple times. The Flash even ran there to get pizza! However, this production art seemingly implies the city will have a bigger role in Arrow's upcoming season. Fans will just have to wait and see whether Coast City is simply a vacation spot for Oliver and Felicity or if the location's connected to the plot with Damien Darhk and H.I.V.E. The city will appear in the flashback, but seeing as those tend to connect to the present, it's of course possible the city will play a role in the "modern" story, too.
While many viewers would love to see Green Lantern in the show (the character has plenty of history with Green Arrow in the comics, after all), Hal Jordan or John Stewart's appearance doesn't seem likely considering Warner Bros' cinematic plans for the cosmic characters - Green Lantern Corps has been announced for 2020. Even though the CW is using Grant Gustin as Flash - a superhero Ezra Miller will play on the big screen - WB having its own plans for DC characters has prevented the CW-verse from using certain individuals before.
Harley Quinn couldn't be used for more than a quick cameo and it has been stated that Booster Gold won't appear in Legends of Tomorrow - the upcoming spinoff show - any time soon because the character is possibly being "groomed for bigger things." There was even the possibility that John Diggle (David Ramsey) could become John Stewart - another Green Lantern - but Guggenheim pointed out that DC has other plans for that character. Because of these examples, it seems likely that Green Lantern's presence will be teased - and fans may even be lucky enough to get a quick glimpse of the character - but don't be surprised if Season 4 doesn't heavily involve Hal Jordan or John Stewart. That said, there's always the chance of the show involving a Green Lantern who won't have a prominent role in the upcoming movie - there is a big group of Green Lanterns, after all. If so, fingers crossed for Ch'p. We know that's incredibly unlikely to happen, but it would certainly lighten the tone for a bit, wouldn't it?
Season 2 of The Flash premieres Tuesday, October 6 at 8pm/7 c; Season 4 of Arrow debuts Wednesday October 7 at 8pm/7 central; Legends of Tomorrow begins in 2016.