Tom Hiddleston and Chris Hemsworth were spotted shooting some kind of flashback scene for Avengers Infinity War in Atlanta on Nov 3, 2017. Based on the costumes they both wore same ones they had in the end of the first Avengers film.
Remains to be seen if it ends up in the film itself. Avengers Infinity War opens wordlwide on May 4, 2018.
Source: Daily Mail