Link to the Animatrix cartoon series 4 free episodes of nine that cover the background of the Matrix and Zion in Japanamation....nice
http://www.empiremovies.com/movies/matrix/revolutions.shtml
Link to the European Revolutions trailer...glimpse a clue of what the next movie is about and what happened to Zion
The video game is also suppose to glimpse some clues into the next movie
http://www.cavola.co.uk/forums/index.php?s=5b9b71108459b90345f2bd65e86094aa&act=ST&f=33&t=653&st=0