At the end of the Avengers 4 trailer, Scott Lang appears at the Avengers facility in New York.
While there’s a lot of attention being focused on what or who is missing from the Avengers: Endgame trailer, there’s quite a bit in there to dissect.
The Russo Brothers obviously want us to believe that Scott Lang magically popped out of the Quantum Realm in present day and landed in New York.
The Avengers: Endgame trailer doesn’t make it look like a whole lot of time has passed, especially with Tony Stark running out of food and water while stranded in space.