As of January 2007, the revised (and completely renumbered and reorganized) California Rules of Court will go into effect.
For a heads-up on what's coming, you can get the text of the rules along with tables to lead you from the old rules to the new, and vice versa, at the California Rules of Court reorganization page. (Print publications from West and LexisNexis should catch up with the changes by the end of 2006.)
For more information, see the news release describing the revisions and reorganization (PDF; 2 pages) or the complete report on the reorganization of the California Rules of Court (PDF; 148 pages).
(Thanks to Peg LaFrance for the tip!)