As you can see in the Tweets below, emergency vehicles and signs for LuthorCorp have been spotted on the set of Supergirl season two, and they confirm that at least some of the season will take place in Metropolis. However, with Kara Danvers getting a new job at CatCo and production moving from Los Angeles to Vancouver, could the Girl of Steel be about to make the move there from National City?
Chances are she's just visiting her cousin, but the presence of LuthorCorp is definitely interesting. While those signs may very well be little more than an Easter Egg for eagle eyed fans, it's possible that Lex could be introduced somewhere down the line. We'll have to wait and see, but getting to explore Superman's home from the perspective of Supergirl should be a lot of fun when the show returns.