See this Sacramento Bee column. A snippet:

Gov. Arnold Schwarzenegger, denouncing the gerrymander as undemocratic, wants to change it with a ballot measure that he hopes would lead to new districts being drawn for the 2006 elections by an independent panel of retired judges. Democrats and unions and other groups that can now control the outcome of Democratic primaries don’t like it, nor do some Republican congressmen whose tenure would be threatened by new districts.
It’s an uphill battle, not only to get the measure qualified and passed by voters, but also to survive the inevitable court tests. An outline of the potential challenges was aired Thursday during a special legislative hearing in which Democrats’ handpicked witnesses complained about the technical complexities of middecade redistricting.
Potentially, the most serious legal problem is that since 2000, California’s population has grown by nearly 3 million, and therefore the 2000 census data are no longer accurate enough to equalize populations of new districts. Democrats are hinting that they might be willing to create an independent panel for the post-2010 census redistricting. Schwarzenegger must decide whether to take them up on that semioffer or press ahead and risk losing either at the polls or in the courts.