Thanks to the legal blog Volokh Conspiracy, I spotted Judge Ishii's order denying California's motion for summary judgment in a case raising constitutional challenges to California's 10-day gun waiting period in Silvester v. Harris, No. 1:11-CV-2137-AWI (E.D. Cal. Dec. 9, 2013).
UCLA Law Professor Eugene Volokh's blog post excerpts the portion of the opinion that suggests the waiting period may violate the Second Amendment and quotes from his law review article on the topic.