What might Endgame's endgame be?
The first Avengers: Endgame trailer also looks like it might be a huge misdirect to hide the order in which the team comes together. Given what we've seen in Captain Marvel, and assuming those gaps in certain shots of the trailer aren't just bad directing, it looks like, in the wake of Avengers: Infinity War, Captain Marvel will be drawn to the Avengers HQ first.
Then, in that "looking up in the sky at night" shot I mentioned above, Nebula and Tony Stark manage to make it back to Earth. Tony looks crushed, though, possibly because of the loss of Peter Parker or because he almost didn't get to see Pepper, so he doesn't stick around and leaves Nebula with the Avengers. It's Scott who ends up bringing Tony back into the fold when he needs science help with the quantum realm. Hank Pym's entire career was about keeping his tech out of the hands of Stark, so Scott Lang would know that's the Avenger who can actually use it.
The end of the shareholders footage featured a bunch of Avengers in a spaceship: Rocket Raccoon, Thor, Nebula, a suited-up Captain America, War Machine, and Black Widow. Rocket asks who hasn't been into space before and for the newbies not to throw up. Point being, Nebula goes from being trapped with Tony Stark in space to part of the Avengers very quickly, and during that time, Iron Man is absent from the team.
Conclusion: Banner and Tony Stark (science bros!) team up with Scott Lang to science-up some sort of solution to obtaining at least one Infinity Stone from the past.
Granted, most of these conclusions are speculation based on teasers, unreleased footage and other clues, but even with digitally deleted characters and altered hair colors in the Endgame teaser footage, we're starting to get enough pieces of the puzzle to see what the goals are for our Avengers.
So far, with only a few weeks before the premiere date of Avengers: Endgame, there's no sign of our snapped heroes or whose MCU fate will come to an end this film, with only a few weeks before the premiere date.