Princess announced that for the 2008-2009 Mexico season, Sapphire Princess will operate the their traditional 7-day Mexican Riviera sailings from Los Angeles. The line will also position Star Princess in San Francisco for 10-day cruises.
Update from CND: The real news in this story is Princess' return to the San Francisco/Mexico market, although it will be with only six sailings in the fall 2008 and spring 2009 time frame. In between, Star Princess will be sailing around the southern part of South America (during their summer season). The lack of peak winter sailings from San Francisco seems to be another of those cases where there's more demand for ships than Princess has ships. In this case, South America wins because there's more money to be made in South America than in San Francisco to the Mexican Riviera.