Ant-Man and the Wasp: Quantumania, which will be released in cinemas in February 2023, will mark Jonathan Majors’ formal MCU debut as Kang the Conqueror, however, leaks about Avengers: The Kang Dynasty have apparently hinted at a potential movie spoiler.

It is wise to take these rumors with a grain of salt as Marvel has not yet verified anything or taken any official action on the matter. For the time being, several sources point to comparable story themes that were present in The Kang Dynasty‘s original script.
Again, keep in mind that the “final screenplay” that Marvel will push through will determine whether or not these are correct. Since it won’t be delivered until 2025, and this is the initial version, there is a good probability that some of the specifics will alter in the future.
Recap: Kang the Conqueror was predicted to replace Thanos as the major antagonist of the future Marvel Phase Five because Thanos’ era came to an end in Avengers: Endgame. The character of Jonathan Majors was initially introduced in Loki Season 1 as He Who Remains, and his first appearance in the MCU was in the Ant-Man and the Wasp: Quantumania teaser.
We will see Kang interact with Nathaniel Richards in Avengers: The Kang Dynasty, which will naturally be the focus of the leaks. Richards is one of Kang’s variations who used the multiverse to effectively conquer a number of worlds.
According to @marvelnewss on Twitter and Heavy Spoilers (via The Direct), we will see Shang-Chi, Captain America (Sam Wilson), and the new Black Panther lead the fight against Kang in the movie.
With how long Marvel films have been hinting at Kang the Conqueror, there is little question that Avengers 5 will surpass all previous box office records due to rumors that it will include even more characters, particularly given the utilization of the multiverse idea. You may read more about this story and get additional updates here.
The current release date for Avengers: The Kang Dynasty is May 2, 2025.