ANOTHER STRANGE SET PHOTO FROM AVENGERS 4!
As I said earlier, it’s clear to see that there’s been some time warping involved (probably by Thanos using the Time Stone). This is NOT a flashback, seeing as though Ant-Man is there, so this is most likely time travel (to the first Avengers movie, during the battle of New York).
Anyway, check out those strange devices on their hands. I’m almost certain that they’re provided by Ant-Man, seeing as though his device is already embedded onto his suit. He and the Wasp must make some interesting developments regarding the Quantum Realm during their movie, which seems to bleed into Avengers 4, granting the time-warped heroes help… of some sort. Perhaps they time travelled willingly, through means of the Quantum Realm, and those devices are keeping things ‘stable’, or at least, keeping them ‘safe’. More details on the devices will more than likely be added in post production, so your guess is as good as mine! (Just kidding – my guess is better than yours. No? Let me know your theories in the comments!)