Is Captain America or Iron Man about to die? What Avengers: Endgame trailer tells us

Captain America – Seen in trailer crying and mourning his lost comrades, something he does have experience with. The Winter Soldier suit also appears to have made a comeback.

Iron Man – Stuck in space and thinks he’s about to die.

Thor – Rocking an Eminem-style hoodie and looking despondent like he lost a rap battle to Star Lord (then realises Star Lord is gone)

She is seen in what's believed to be Japan where Hawkeye appears to have embraced his Ronin avatar and become an assasin.

She's also seen with Steve, holding Steve Rodger’s compass. Does it mean Steve is going to die?  OMG

He appears to have become an assassin after losing his family and has embraced his alter ego Ronin.

Mourning his lost comrades including Shuri

Nebula - Two different shots show her mourning Gamora.

Ant-Man: Shows up in the trailer, even though at times it appears to be archive footage. He had disappeared in the Quantum Realm

Captain Marvel – Not seen in trailer, but she’s definitely alive and coming to kick some ass.

Okoye – Not seen in trailer

M’Baku – Not seen in trailer

Loki: Killed by Thanos in Infinity War. He will however be seen in Avengers 4, which could very well be a flashback scene.

It appears Quicksilver will also be back. 

Murdered by Thanos and his children when they invade Thor’s ship. Before dying he opens up a portal to send Bruce Banner/Hulk to earth to warn them about the impending doom.

Wanda destroys the Infinity Stone inside Vision’s head but Thanos rewinds time and crushes his head before taking the Infinity Stone. A colourless Vision is left lifeless.

Gamora: Perhaps the most emotional death in the movie, when it’s revealed that Thanos loves her like a daughter but will have to sacrifice her to possess the Soul Stone.

Those who disintegrated after the Snap:

 Black Panther, Spider-Man/Peter Parker, Doctor Strange, Winter Soldier

Falcon

 Scarlet Witch/ Wanda

 Star-Lord

Groot

Drax
Mantis

Nick Fury

Maria Hill

Pepper Potts (accidentally revealed a spoiler)

 Hawkeye

Valkyrie

Korg and Miek (Valkyrie, Korg and Miek most probably escaped on a different ship)

Howard the Duck

Ned: Spoiler (Probably alive)

 Aunt May: Alive

"Endgame" marks the final film within the Marvel Cinematic Universe's current generation. It comprises 22 films, including "Spider-Man: Homecoming" and the upcoming "Captain Marvel".