Kevin's Watch

The last scene in the trailer is the earliest in the film chronologically. Nat has her short blonde hair from Infinity War, so Captain Marvel arrives on earth and meets the Avengers pretty early after the snap. The majority of the film takes place months later, after Nat has had time to grow her hair out.

When the trailer moves to Hawkeye, it shows a clip of him teaching his daughter to shoot before going to current-day Clint, giving the strong impression he lost his family in the snap. Guessing he shows up on the radar months after the fact and Nat goes to bring him in.

There's a brief shot of Scott on a street seeing all the missing posters, suggesting he just got back from the quantum realm and has no idea what's going on.

They're not being coy about this bit any more: Tony Stark and Nebula make it to Earth. They're in the later shots of the Avengers in what people are apparently saying are "quantum suits". Also notable is that Thor, Captain Marvel, and Hulk are not shown - this could be significant since they are the three most powerful Avengers.

Thanos is also entirely absent from any of the trailers so far, so they're keeping his role in the story quiet. I wonder if Thor, Carol, and Bruce are off keeping him distracted while the others hop into the Quantum Realm to undo what he did.

The Avengers are apparently able to track where Thanos is and when he uses the Infinity Stones, and this clip is from very early in the film - they just met Carol, only people who were in Wakanda are there, Nat's hair is still as it was in Infinity War - so it looks like they're going to go confront Thanos pretty quickly. But we know from other clips that this film jumps ahead months, perhaps even a year, before Japan, Hawkeye, and the quantum suits. So I can only assume they try and fail to face Thanos, and the suggestion in this clip - beat him, take the Infinity Stones, use them to save everyone - is not the solution that will work.

"Let's go get this son of a bitch!"