Time travel in Avengers 4 confirmed.

Avengers infinity war is breaking all the records of box office collections.And become the first highest grossing movie in a week and reached the 1 billion within 10 days
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In the end of the movie MadTitan Thanos collected all the infinity stones and wiped out the half of  humanity in the universe. But some superheros are also wiped out (Starlord, Spiderman, Dr strange, Drax, Groot, WinterSolder, BlackPanther,Mantis).

Can they are returned in Avenger 4?

Recently Avenger 4 sets photos leaked and we can see Captain America in his old dress.so we can say that time travelled in Avengers 4.The time travelled  is done by Antman because in leaked images there is a gadget in Suit of Antman.This gadget is also worn by others.