There was a legitimate reason for the changes and it was called Lucas's vision for Star Wars. And he let people know what the situation was by doing this Taken from wikipedia By 1996, Licensing was keeping an in-house bible of reference materials as the volume of publications, facts, and figures grew to such unwieldy proportions that it became difficult to know everything relevant to a particular project. They finally decided something had to be done to organize the increasingly large collection of media which chronicled the Star Wars universe. A system of canon was developed that organized the materials into what was and wasn't fit for the Star Wars story. In 2000, Lucas Licensing appointed Leland Chee to create a continuity tracking database referred to as the "Holocron". As with every other aspect having to do with the overall story of Star Wars, the Holocron follows the canon policy that has been in effect for years. The Holocron is divided into five levels (in order of precedence): G-canon, T-canon, C-canon, S-canon, and N-canon. G-canon is George Lucas canon: Considered absolute canon, it includes Episodes I–VI (the most recently released versions) and the upcoming Episodes VII–IX feature films, the animated film, and any statements by George Lucas (including unpublished production notes from him or his production department that are never seen by the public). Elements originating with Lucas in the scripts, filmed deleted scenes, movie novelizations, reference books, radio plays, and other primary sources are also G-canon when not in contradiction with the released films. G-canon overrides the lower levels of canon when there is a contradiction. T-canon is Television canon: refers to the canon level comprising only the two television shows: Star Wars: The Clone Wars and the upcoming Star Wars Rebels. Its precedence over C-Level canon was confirmed by Chee. C-canon is Continuity canon: consisting of materials from the Expanded Universe including books, comics, and games bearing the label of Star Wars. Games and RPG sourcebooks are a special case; the stories and general background information are themselves fully C-canon, but the other elements such as character/item statistics and gameplay are, with few exceptions, N-canon. On April 25, 2014, all previously released C-Canon was officially bumped to S-Canon, and will be replaced by all-new C-Canon material. The first official C-Canon project in the revised continuity will be Star Wars: A New Dawn by John Jackson Miller, which is a prequel novel to Star Wars Rebels. It will be released September 2, 2014. S-canon is Secondary canon: the story itself is considered non-continuity, but the non-contradicting elements are still a canon part of the Star Wars universe. This includes all C-canon material released prior to April 25, 2014, video games such as the online roleplaying game Star Wars: Galaxies, and certain elements of a few N-canon stories. N-canon is Non-canon: "What-if" stories (such as stories published under the Star Wars: Infinities label), crossover appearances (such as the Star Wars character appearances in Soulcalibur IV), game statistics, and anything else directly contradicted by higher canon ends up here. N-canon is the only level that is not considered official canon by Lucasfilm. Any published material that contradicts things established in G-canon and T-canon is considered N-canon.