Near the end of the aformentioned movie, we are shown the aftermath of a museum robbery which has been thwarted by Wonder Woman. It is this scene that some Reddit users, over on the DCEU-dedicated subreddit, claim that we were treated to not just one of DC's leading ladies, in this scene, but two.
Immediately as we enter the scene, the viewers eye is drawn to the tall, slender woman being escorted in handcuffs by a police officer. There are multiple other goons who are tied up by The Lasso of Truth just behind Diana, who presumably also took part in the robbery. We know that Selina Kyle isn't opposed to theft and the woman shown also seems to match her in likeness.
However, if that isn't enough to sell you on it; Moments after the supposed Catwoman is escorted off-screen and Diana places a golden figure back into a crate, she is greeted by a group of children. One red-headed girl in particular is wearing a set of black cat ears. Some users even go so far as to claim the golden figure Diana places into the crate is very cat-like.