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• The quinjet arrives in Tokyo (the bridge is the rainbow bridge). This could be Natasha looking for Clint.
• The next shot shows Natasha and Clint on the benetar (the Guardians of the Galaxy ship), the vessel that Tony and Nebular are stuck on.
• On the ship are reportedly: Black Widow, Ronin (Hawkeye), Tony, Nebula, Rocket and Carol Danvers (Captain Marvel) and they are reportedly going to ‘Titan 2’ to confront Thanos.
• Back in HQ, behind Scott is a light and it could be 3 things: Carol going binary. Thor returning. Or the HQ is under attack.
• Thor’s shot with electricity charged on him and Stormbreaker looks like him being in Wakanda. However it isn’t a flashback as his expression has changed. This could be Thor and the Avengers now being in a different timeline, replaying and redoing the events of Infinity War and the Wakandan fight.
• Nebula could also have the same fate. She looks like she is back on Titan and now redoing her fight with Thanos from Infinity War in a different timeline. This time, she may decide to not tell Star Lord (Peter Quill) that Thanos killed Gamora so he does not punch Thanos and break him out of his trance.  
• This could all relate of how Tony Stark’s B.A.R.F technology.
• Captain America tightens his shield and now seems to be wearing his old school Civil War and Age of Ultron suit, supporting the theory that the Avengers shall have to time travel to past events.
• Captain America also looks to be in the same scene as Rocket, War Machine and Nebula as the scene texture, shadows and smoky feeling all seems to match.
• The horizon behind Cap looks vaguely familiar to that of Thanos’ farmhouse that he is on ‘Titan 2’ and at the end of Infinity War.
• There is something purple behind Cap (hint, hint) Thanos.
• A theory is that the Avengers shall fail again as Kevin Feige (head of Marvel Studios) and the Russo Brothers (the directors of the Avengers movies) has stated that all new footage from the trailer only shows 15 minutes of the movie which is over 3 hours long.
• Scott as an ant size could show him on the desk in Avengers HQ where it is under attack.
• Perhaps, the Avenger’s attempt to fight Thanos again could lead to him striking back and attack their HQ.
• Where we see the Avengers walking through the HQ, Tony Stark and Nebula are with them!
• All the Avengers are wearing the black, white and red armour, armour for the Quantum realm.
• The black, white and red suit matches the past footage in the early parts of the trailers which colours are only black, white and red.
• Thor, Carol Danvers, Rocket and Hulk aren’t part of it though so this could be a scene that doesn’t make it in the actual movie itself. The Russo Brothers also did this for the shot of the Wakandan March scene that included Hulk however that didn’t make the cut in Infinity War.
• Marvel Studios have the power to de-age Samuel L Jackson (Nick Fury) and Clark Gregg (Agent Phil Coulson) so making a fake scene isn’t a big deal for them.
• Carol Danvers doesn’t flinch when Thor summons Stormbreaker.

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