Matrix 4 brings Neo and Trinity back after they both died in the third film of the original saga, as a sacrifice to save the world and ensure peace between machines and humans.
The Matrix 4 In that same movie, the Oracle reveals that this was not going The Matrix to last forever and that there would come a point where The One would be needed again, and that moment is now. The first images of Matrix Resurrections show an older Neo, with no recollection of his previous life and being medicated by a psychiatric suspect who is determined to prevent him from waking up again.
The Matrix 4 We don't know what happened between Matrix 3, which is called Revolutions, and this fourth installment, but it is clear that the world needs the chosen one again and that Neo is going to have to face new enemies in the process, with the help from a few veteran allies and newcomers to the saga.
Keanu Reeves and Carrie-Ann Moss were the first confirmed (for obvious reasons), but there are many more characters in this story who have a role to play.
As every Matrix fan remembers, both characters died in the previous movie, but in the Matrix no one really dies, so here we have two versions of the characters that are older. Neither of them remember their past and, in Neo's case, that is because they have been medicating him with the blue pill.
He begins to remember something when he runs into Trinity in a cafe and that seems to be the key moment in the story, which leads The One on the right path to fight for humanity again.
The Mexican actress, who appeared in the series Sense 8, shared the poster of her character, where she can be seen wearing a look very similar to the one Trinity wore in the 90s. Not much is known about her character yet, but she confirmed that it is She calls Lexy and, by not wearing the classic blue color that seems to identify the villains of this movie, we can assume that she will be an ally for Neo and his companions.
The protagonist of Candyman is a younger version of Morpheus, but we don't know exactly what caused the change, why he looks younger, or why he seems to remember everything when Neo and Trinity lost their memory.
Laurence Fishburne said that she was not asked to come back for the film, so this is not a coincidence, there is a reason for it and we will surely know her until the moment of the premiere.
This is another of the classic characters that are back, it is one of the oldest programs of The Matrix, he is the leader of a band of exiles (or programs that should be deleted) and has a kind of "road" through the that all kinds of data can be transported. We don't know what his role is exactly from him, but Neo may have to enlist his help to carry out his new mission.