A new, presumably final trailer for the highly anticipated bladder endurance test Avengers: Endgame hit the internet today. It doesn't give us a whole lot to go on. There are a lot of flashbacks to previous Marvel movies, but with the color drained save for red -- either a stylistic choice, or a coded reference to Marvel's communist sympathies.
But if you really want some clues about how Endgame will play out, you have to pay attention to the haircuts and outfits. First off there's Black Widow. At the end of the trailer, when Captain Marvel shows up, Natasha is sporting the same blonde bob she wore in Infinity War.
Later she has a longer, darker blonde hairstyle while firing off rounds at a target that is disappointingly not Thanos-shaped.