Ant-Man

Based on the information you provided, the new Marvel Cinematic Universe (MCU) timeline order, including the addition of "Ant-Man and The Wasp: Quantumania," is as follows:

Captain America: The First Avenger
Captain Marvel
Iron Man
Iron Man 2
The Incredible Hulk
Thor
The Avengers
Thor: The Dark World
Iron Man 3
Captain America: The Winter Soldier
Guardians of the Galaxy
I Am Groot: Groot's First Steps
Guardians of the Galaxy Vol. 2
I Am Groot: The Little Guy
I Am Groot: Groot's Pursuit
I Am Groot: Groot Takes a Bath
I Am Groot: Magnum Opus
Avengers: Age of Ultron
Ant-Man
Captain America: Civil War
Black Widow
Black Panther
Spider-Man: Homecoming
Doctor Strange
Thor: Ragnarok
Ant-Man and the Wasp
Avengers: Infinity War
Avengers: Endgame
Loki
What If...?
WandaVision
The Falcon and the Winter Soldier
Spider-Man: Far From Home
Shang-Chi and the Legend of the Ten Rings
Eternals
Doctor Strange in the Multiverse of Madness
Hawkeye
Moon Knight
Black Panther: Wakanda Forever
She-Hulk
Ms. Marvel
Thor: Love and Thunder
Werewolf by Night
The Guardians of the Galaxy Holiday Special
Ant-Man and The Wasp: Quantumania

Please note that this timeline order is subject to change as new projects are released in the MCU