Today Arrow Executive Producer Marc Guggenheim shared with fans on Twitter some production art for the upcoming season. Now the art isn’t terribly exciting, but it does show something interesting for DC fans. The art is a vintage postcard featuring a look at Coast City. As you may or may not know, Coast City is where Hal Jordan, aka Green Lantern, originated from. Now Ferris Airlines has been teased multiple times over the past three season, but could we now be getting a little more? Will Hal Jordan be making an appearance this season? Or this nothing more than just another of those teasers? Arrow Season 4 premieres on Wednesday, October 7th at 8 p.m. EST on The CW.