It is true that California voters are presented with a "jungle primary"... all candidates run in a single primary, all voters see all candidates, and the top two vote-getters (regardless of party) run in November.
But... not the presidential candidates. And this year California moved its entire primary, presidential votes and all, to March 3rd, Super Tuesday.
There could be some confusion about who gets which ballots, although the Democrats did open their primary to all voters (as did Libertarians and American Independent Party). BUT, under brand-new California law, voters can change their registration right on election day. Shasta County Clerk Cathy Darling Allen helps us understand the intracacies of this year's California Primary.
Link: to California Voter Registration.