Details: …The 2nd District Court of Appeal in Los Angeles on Tuesday denied, without comment, an appeal of a lower court decision rejecting a challenge to [Prop 13] from Charles Young, the former chancellor of the UCLA campus. Although Proposition 13 was upheld by the state Supreme Court shortly after its passage, Young contended that by requiring a two-thirds legislative vote for imposing new taxes, the measure constituited a "revision" of the state constitution that could not be enacted by voters. While voter-approved initiatives can amend the constitution, revisions -- a more fundamental form of change -- must go through a constitutional convention or a constitutional revision commission…
Full story at http://blogs.sacbee.com/capitolalertlatest/2012/07/california-appellate-court-turns-back-challenge-to-proposition-13.html
Overturning the two-thirds requirement would be a major change in California's post-13 fiscal arrangements. There have been several unsuccessful legal challenges to Prop 13 since it was enacted. The most well known (but unsuccessful) challenge, which went before the U.S. Supreme Court, was the Nordlinger case. Background:
Update: I am told an appeal of the current case to the California Supreme Court is likely.