On the same day Geoff Johns closed the book on speculation that The Flash and Arrow will share a universe with big-screen DC outings like Batman V Superman: Dawn of Justice, a new conspiracy theory custom-made for fans may have cropped up.

That's because the Man of Steel Fan Page have tweeted an image of a LuthorCorp trailer on the set of The Flash.

LuthorCorp -- and the logo on this truck in particular -- is the name of Lex Luthor's company (called LexCorp in the comics and in Man of Steel) in Smallville, a show that a small but vocal contingent of fans had hoped would be in some way connected to Arrow.

(This would be nearly impossible to pull off, since the character of Oliver Queen is so wildly different in the two series.)

One of our writer's, Matthew, saw this around #TheFlash set today in Vanouver. Hmmm. #LuthorCorp pic.twitter.com/pLPRUDTK5d — Man of Steel Fanpage (@ManofSteelFanPg) July 19, 2014

LuthorCorp did briefly control Queen Consolidated in Smallville.

Whether it's just an Easter egg for the fans or LuthorCorp is actually a thing that exists in the Arrowverse isn't totally clear -- and even more than that, one commenter on Twitter noted that it could simply be that The CW owns this trailer from the Smallville days and is using it as a pracitcal truck hauling stuff around or using it for green screen or something. If that's the case, this logo might not ever make it to air.

Trailers for The Flash have shown that Ferris Air, where Hal "Green Lantern" Jordan works, also has an Easter egg (at least) in the pilot episode.