Also so far I've concluded this is what I'd be having based on the trailers.
-Batman being with Tony and Nebula. Cyborg who went with him along with Doctor Strange, Peter and Tony to Titan didn't survive The Snap.
-Deadshot, Harley Quinn, Rick Flag, Superman and Wonder Woman being with the survivors back on earth (Ant-Man, Black Widow, Bruce Banner, Captain America, Hawkeye, Rocket Raccoon, Thor and War Machine). Aquaman, Captain Boomerang, Flash, Katana and Killer Croc were among the victims of The Snap.
-Batman, Deadshot, Harley Quinn, Rick Flag, Superman and Wonder Woman all wears quantum suits alongside Ant-Man, Black Widow, Bruce Banner, Captain America, Captain Marvel, Hawkeye, Nebula, Iron Man, Rocket Raccoon, Thor and War Machine supposedly all ready to restore the universe that Thanos caused.
These aren't from the trailer but things I concluded so far that happens in the merged timeline during these events.
-Deadshot and Rocket bonding with each other and developing a friendship especially over the loss of those they loved in The Snap (Zoe Lawton and Groot). During the Battle of Wakanda after failing to get anything from Aquaman (His trident) and Bucky (His shotgun and arm) much to Rocket's delight. Deadshot was interested in selling some of his guns to him who in turn would like to buy some of Rocket's.
-Amanda Waller, Aquaman's parents, Deathstroke, Henry Allen, James Gordon, Lex Luthor, Lois Lane, Mera and Silas Stone all survives The Snap.
-Alfred, Black Manta, Dr. June Moone, Hippolyta, Joker, Martha Kent, Nuidis Vulko, Ocean Master, Perry White and Zoe Lawton all died in The Snap.