Silver: We're going to make Matrix II and III together. It's a unique situation where...the story does continue. Other sequels I've been involved in, we've had to sit down and figure out a story. But in this movie, the story is continuing. Essentially, the boys [writers/directors the Wachowski brothers] intended to make Matrix because they wanted to find a way to make a superhero movie today where the audience would accept superheroes in a way that wouldn't feel to them like Saturday morning television. And they made the first movie to set up that world. In the sequels, you're going to see that Neo has superhuman powers, and they can really do what they've always wanted to do.

Are we going to see Zion, the last human habitation, which was only talked about in the first film?

Silver: Oh, you're going to see Zion.

Any other plot elements you can tell us?

Silver: I can't really tell you that much. But it's going to be incredible.

Does Carrie-Anne Moss, who played Trinity, return?

Silver: Yes, Carrie-Anne will be in it. Her deal's not done yet. But Keanu's [Reeves, who plays Neo] deal is done, and Laurence Fishburne [Morpheus]. And it's all coming together.

Keanu will join Matrix2?(1999/7/25)

Accroding to some news source,Keanu has signed on Matrix 2 and 3.
13th July 1999
From Jam! Showbiz


HOLLYWOOD -- There won't be one, but two sequels to this spring's box-office hit, The Matrix. Keanu Reeves has signed on for Parts 2 and 3, Australia's Daily Telegraph reports. No dollar figures were announced, but the Daily Telegraph reports Reeves has opted for a salary tied to the box-office performance of the sequels. The first film has already racked up $166 million US. Warner Bros. plans to release both sequels within mere months of each other. There's no word when the back-to-back production begins, or when the movies will arrive in theatres.

23th July 1999
From Cinescape-Movie-Matrix2

Reeves Talks Matrix Sequel

It seems as if in order for Keanu Reeves to return for more Matrix films, there was more than just money and a script to be considered. As major part of his preparation for his role in The Matrix, Keanu Reeves had to go through martial arts training courtesy of Yuen Wo-ping, a Hong Kong director as well as fight choreographer. While talking to the Wall Street Journal, Reeves revealed, "He's the greatest. When you watch Wo-ping's fight scenes, you can see such joy in his work. He's amazing. The whole experience was special, one of the best of my life."

Regarding more Matrix films, Reeves reveals, "There's no question that I'd come back for two more." Reeves adds joking, "The real problem is Yuen Wo-ping. Who knows if he'll be too busy by then."