The current rumor going around is that there is a possible new Matrix movie in the works. The Wachowski Brothers apparently have started the writing process. They have turned in outlines and treatments to the studios.
Warner Brothers is apparently looking for a hit franchise that they can put up against the upcoming Star Wars and Avatar movies. They are hoping to have something for 2017.
Right now this is just a rumor nothing substantial; I know many fans are not looking forward to another Matrix movie after the third one. There is a chance that this will be a prequel if it is made.
The question is; are fans ready for another Matrix trilogy? Do fans even want another Matrix movie?