Avengers 4 Trailer Decoded: Every Character Analysed & Explored
7. Black Widow (Scarlett Johansson)
Black Widow serves as one of the storytellers in the Endgame trailer, reiterating that Thanos did exactly as he intended to do in what appears to be a debriefing at the Avengers facility. This suggests that she's checked the statistics, because, beyond their immediate situation in Wakanda, the snap survivors could have no hope of knowing for certain that he managed to wipe out half of the universe's life.
It would seem that that scene comes immediately after the snap and before any rumoured time jump. Less clear is when the scene between her and Clint Barton in Japan takes place, as it would seem Barton has had enough time to take in his obvious personal tragedy and remove his self-imposed house arrest rules. So perhaps that happens a few years into the future beyond the Decimation?
If that is the case, it seems likely that we're going to see Widow's Avengers story come full circle. In The Avengers, she was tasked with finding and bringing in Bruce Banner, who was considered the rogue element of the team and now she'll probably be doing the same for Barton. She's arguably got a more difficult job on her hands this time, though...