While the DC cinematic universe has never seen a Justice League, that doesn’t mean it has been without heroes or protection from interstellar threats. The debut trailer for the film refers to a previous age of heroes, and many aspects of those forces will come into play as members of the League. If a recent theory is right, though, there might be another hero in play soon enough.
In the trailer, a previous age of heroes is referred to, and fans see that play out via an epic fight battle sequence that pits Darkseid’s forces against the Amazons. Some eagle-eyed Reddit viewers noticed something else in the footage, however, pointing to two unique characters off in the distance. Specifically, there are two winged beings flying by the incoming ships and towards the mountain. Now, you could easily dismiss this as more Parademons, perhaps just catching the light in the right way. That could very well be the case, but if you look at the enlarged image their wings seem bright white in comparison to the gunmetal metallics of the Parademons.
There are also two of them flying about, and some of the laser fire is actually heading towards them. It would seem to indicate that perhaps the Thanagarians also played a part in this early alliance, and if so could set the stage for Hawkman or Hawkgirl coming aboard the league in the future.